OBSEVA SA (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 100000 - Document - Document and Entity Information Network

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2 Implied Table Table

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3 Document And Entity Information [Abstract] Abstract obsv:DocumentAndEntityInformationAbstract
4 Document Type Concept (Submission Type) For Period dei:DocumentType
5 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
6 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
7 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
8 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
9 Trading Symbol Concept (Text/String) For Period dei:TradingSymbol
10 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
11 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
12 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
13 Entity Well-known Seasoned Issuer Concept (Yes/No) For Period dei:EntityWellKnownSeasonedIssuer
14 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
15 Entity Filer Category Concept (Filer Category) For Period dei:EntityFilerCategory
16 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
17 100010 - Statement - Consolidated Balance Sheet Network

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18 Implied Table Table

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19 Statement Of Financial Position [Abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
20 ASSETS Abstract ifrs-full:AssetsAbstract
21 Current assets Abstract ifrs-full:CurrentAssetsAbstract
22 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
23 Other receivables Concept (Monetary) As Of Debit ifrs-full:OtherCurrentReceivables
24 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
25 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
26 Non-current assets Abstract ifrs-full:NoncurrentAssetsAbstract
27 Furniture, fixtures and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
28 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
29 Other long-term assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
30 Total non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
31 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
32 LIABILITIES AND EQUITY Abstract ifrs-full:EquityAndLiabilitiesAbstract
33 Current liabilities Abstract ifrs-full:CurrentLiabilitiesAbstract
34 Other payables and current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentPayables
35 Accrued expenses Concept (Monetary) As Of Credit ifrs-full:CurrentAccruedExpensesAndOtherCurrentLiabilities
36 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
37 Current tax liability Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilitiesCurrent
38 Non-current liabilities Abstract ifrs-full:NoncurrentLiabilitiesAbstract
39 Post-employment obligations Concept (Monetary) As Of Credit ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan
40 Other long-term liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
41 Total non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
42 Shareholders’ equity Abstract ifrs-full:EquityAbstract
43 Share capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
44 Share premium Concept (Monetary) As Of Credit ifrs-full:SharePremium
45 Reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
46 Accumulated losses Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
47 Total shareholders’ equity Concept (Monetary) As Of Credit ifrs-full:Equity
48 Total liabilities and shareholders’ equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
49 100020 - Statement - Consolidated Statement of Comprehensive Loss Network

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50 Implied Table Table

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51 Statement Of Comprehensive Income [Abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
52 Operating income other than revenue Concept (Monetary) For Period Credit ifrs-full:RevenueAndOperatingIncome
53 OPERATING EXPENSES Abstract obsv:OperatingExpenseAbstract
54 Research and development expenses Concept (Monetary) For Period Debit ifrs-full:ResearchAndDevelopmentExpense
55 General and administrative expenses Concept (Monetary) For Period Debit ifrs-full:SellingGeneralAndAdministrativeExpense
56 Total operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
57 OPERATING LOSS Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
58 Finance income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
59 Finance expense Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
60 NET LOSS BEFORE TAX Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
61 Income tax benefit / (expense) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
62 NET LOSS FOR THE YEAR Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
63 Net loss per share Abstract ifrs-full:EarningsPerShareAbstract
64 Basic Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
65 Diluted Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
66 OTHER COMPREHENSIVE LOSS Abstract ifrs-full:OtherComprehensiveIncomeAbstract
67 Items that will not be reclassified to profit and loss Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract
68 Remeasurements on post-employment benefit plans Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
69 Items that may be reclassified to profit or loss Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract
70 Currency translation differences Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation
71 TOTAL OTHER COMPREHENSIVE LOSS Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
72 TOTAL COMPREHENSIVE LOSS FOR THE YEAR Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
73 100030 - Statement - Consolidated Statement of Cash Flows Network

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74 Implied Table Table

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75 Statement Of Cash Flows [Abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
76 NET LOSS BEFORE TAX FOR THE YEAR Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
77 Adjustments for: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
78 Depreciation expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationExpense
79 Post-employment cost / (benefit) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities
80 Share-based compensation expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
81 Income tax paid Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidClassifiedAsOperatingActivities
82 Finance (income) / expense, net Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForFinanceIncomeCost
83 Increase in other receivables Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherOperatingReceivables
84 Decrease / (increase) in prepaid expenses, deferred costs and other long term-assets Concept (Monetary) For Period Debit obsv:AdjustmentsForIncreaseDecreaseInPrepaidExpensesDeferredCostsAndOtherLongTermAssets
85 Increase / (decrease) in other payables and current liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInOtherOperatingPayables
86 Increase in accrued expenses and other long-term liabilities Concept (Monetary) For Period Debit obsv:IncreaseDecreaseInAccruedExpensesAndOtherNonCurrentLiabilities
87 NET CASH FLOWS USED IN OPERATING ACTIVITIES Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
88 Cash used for rental deposits Concept (Monetary) For Period Credit obsv:CashUsedForRentalDeposits
89 Payments for plant and equipment Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
90 Acquisition of a license Concept (Monetary) For Period Credit ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities
91 NET CASH FLOWS USED IN INVESTING ACTIVITIES Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
92 Proceeds from issuance of shares Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
93 Payment of share issuance costs Concept (Monetary) For Period Credit ifrs-full:PaymentsForShareIssueCosts
94 Proceeds from exercise of stock-options Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
95 Payment of deferred costs of financing activities Concept (Monetary) For Period Credit obsv:PaymentOfDeferredCostsOfFinancingActivities
96 Interest paid Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsFinancingActivities
97 Interest received Concept (Monetary) For Period Debit obsv:InterestsReceivedClassifiedAsFinancingActivities
98 NET CASH FLOWS FROM / (USED IN) FINANCING ACTIVITIES Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
99 Net increase / (decrease) in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges
100 Cash and cash equivalents as at January 1, Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
101 Effects of exchange rate changes on cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
102 Cash and cash equivalents as at December 31, Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
103 100040 - Statement - Consolidated Statement of Changes in Equity Network

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 http://www.obseva.com/20181231/taxonomy/role/StatementConsolidatedStatementOfChangesInEquity
104 Statement Of Changes In Equity [Table] Table

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 ifrs-full:StatementOfChangesInEquityTable
105 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
106 Equity [member] Member ifrs-full:EquityMember
107 Share capital [Member] Member ifrs-full:IssuedCapitalMember
108 Share premium [Member] Member ifrs-full:SharePremiumMember
109 Share-based payments reserve [Member] Member ifrs-full:ReserveOfSharebasedPaymentsMember
110 Foreign currency translation reserve [Member] Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
111 Total reserves [Member] Member ifrs-full:OtherReservesMember
112 Accumulated losses [Member] Member obsv:AccumulatedLossesMember
113 Statement Of Changes In Equity [Line Items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
114 Beginning Balance Concept (Monetary) As Of Credit ifrs-full:Equity
115 Loss for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
116 Other comprehensive loss Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
117 TOTAL COMPREHENSIVE LOSS FOR THE YEAR Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
118 Issuance of shares - IPO Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
119 Issuance of shares - PIPE Concept (Monetary) For Period Credit obsv:StockIssuedDuringPeriodValuePrivateInvestmentInPublicEquities
120 Issuance of shares - Incentive Plan Concept (Monetary) For Period Credit obsv:IncreaseOrDecreaseThroughIssuanceOfSharesEmployeeStockIncentivePlan
121 Issuance of shares - June 2018 offering Concept (Monetary) For Period Credit obsv:UnderwrittenPublicOfferingValue
122 Issuance of shares - ATM program Concept (Monetary) For Period Credit obsv:StockIssuedDuringValueAtMarketProgram
123 Issuance of non-voting shares Concept (Monetary) For Period Credit obsv:IncreaseDecreaseThroughIssuanceOfNonVotingShares
124 Acquisition of license Concept (Monetary) For Period Credit obsv:IncreaseDecreaseThroughAcquisitionOfLicense
125 Share issuance costs Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
126 Exercise of stock-options Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
127 Share-based remuneration Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
128 Offset of accumulated losses with share premium Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings
129 Ending Balance Concept (Monetary) As Of Credit ifrs-full:Equity
130 100050 - Disclosure - General information Network

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131 Implied Table Table

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132 Disclosure Of General Information About Financial Statements [Abstract] Abstract obsv:DisclosureOfGeneralInformationAboutFinancialStatementsAbstract
133 General information Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory
134 100060 - Disclosure - Accounting principles applied in the preparation of the consolidated financial statements Network

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135 Implied Table Table

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136 Disclosure Of Accounting Policy [Abstract] Abstract obsv:DisclosureOfAccountingPolicyAbstract
137 Accounting principles applied in the preparation of the consolidated financial statements Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
138 100070 - Disclosure - Financial risk management Network

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139 Implied Table Table

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140 Financial Risks Management [Abstract] Abstract obsv:FinancialRisksManagementAbstract
141 Financial risk management Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialRiskManagementExplanatory
142 100080 - Disclosure - Cash and cash equivalents Network

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143 Implied Table Table

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144 Cash And Cash Equivalents [Abstract] Abstract ifrs-full:CashAndCashEquivalentsAbstract
145 Cash and cash equivalents Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
146 100090 - Disclosure - Receivables and payables Network

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147 Implied Table Table

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148 Subclassifications Of Assets Liabilities And Equities [Abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
149 Receivables and payables Concept (Text Block (HTML)) For Period obsv:DisclosureOfReceivablesAndPayablesExplanatory
150 100100 - Disclosure - Prepaid and accrued expenses Network

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151 Implied Table Table

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152 Prepaid Expense And Deferred Costs [Abstract] Abstract obsv:PrepaidExpenseAndDeferredCostsAbstract
153 Prepaid and accrued expenses Concept (Text Block (HTML)) For Period obsv:DisclosureOfPrepaidExpensesAndAccruedExpensesExplanatory
154 100110 - Disclosure - Furniture, fixtures and equipment Network

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155 Implied Table Table

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156 Disclosure Of Property Plant And Equipment [Abstract] Abstract ifrs-full:DisclosureOfPropertyPlantAndEquipmentAbstract
157 Furniture, fixtures and equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
158 100120 - Disclosure - Intangible assets Network

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159 Implied Table Table

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160 Disclosure Of Intangible Assets [Abstract] Abstract ifrs-full:DisclosureOfIntangibleAssetsAbstract
161 Intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsExplanatory
162 100130 - Disclosure - Other long-term assets and liabilities Network

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163 Implied Table Table

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164 Other Long Term Assets [Abstract] Abstract obsv:OtherLongTermAssetsAbstract
165 Other long-term assets and liabilities Concept (Text Block (HTML)) For Period obsv:DisclosureOfOtherLongTermAssetsAndLiabilitiesExplanatory
166 100140 - Disclosure - Post-employment benefits Network

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167 Implied Table Table

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168 Disclosure Of Defined Benefit Plans [Abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
169 Post-employment benefits Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
170 100150 - Disclosure - Shareholders' equity Network

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171 Implied Table Table

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172 Disclosure Of Classes Of Share Capital [Abstract] Abstract ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
173 Shareholders' equity Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
174 100160 - Disclosure - Revenue and other income Network

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175 Implied Table Table

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176 Revenue and other income[Abstract] Abstract obsv:DisclosureOfRevenueAndOtherIncomeAbstract
177 Revenue and other income Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRevenueExplanatory
178 100170 - Disclosure - Operating expenses by nature Network

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179 Implied Table Table

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180 Expense By Nature [Abstract] Abstract ifrs-full:ExpenseByNatureAbstract
181 Operating expenses by nature Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfExpensesByNatureExplanatory
182 100180 - Disclosure - Staff costs Network

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183 Implied Table Table

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184 Disclosure Of Staffing Costs [Abstract] Abstract obsv:DisclosureOfStaffingCostsAbstract
185 Staffing costs Concept (Text Block (HTML)) For Period obsv:DisclosureOfStaffingCostsExplanatory
186 100190 - Disclosure - Finance income and expense Network

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187 Implied Table Table

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188 Analysis Of Income And Expense [Abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
189 Finance income and expense Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceIncomeExpenseExplanatory
190 100200 - Disclosure - Income taxes and deferred taxes Network

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191 Implied Table Table

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192 Disclosure Of Income Tax [Abstract] Abstract obsv:DisclosureOfIncomeTaxAbstract
193 Income taxes and deferred taxes Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
194 100210 - Disclosure - Loss per share Network

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195 Implied Table Table

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196 Earnings Per Share [Abstract] Abstract ifrs-full:EarningsPerShareAbstract
197 Loss per share Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
198 100220 - Disclosure - Share-based compensation Network

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199 Implied Table Table

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200 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] Abstract ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
201 Share-based compensation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
202 100230 - Disclosure - Commitments and contingencies Network

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203 Implied Table Table

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204 Disclosure Of Commitments And Contingencies [Abstract] Abstract obsv:DisclosureOfCommitmentsAndContingenciesAbstract
205 Commitments and contingencies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory
206 100240 - Disclosure - Related parties transactions Network

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207 Implied Table Table

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208 Disclosure Of Transactions Between Related Parties [Abstract] Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
209 Related parties transactions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
210 100250 - Disclosure - Going concern Network

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211 Implied Table Table

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212 Disclosure Of Going Concern [Abstract] Abstract obsv:DisclosureOfGoingConcernAbstract
213 Going concern Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGoingConcernExplanatory
214 100260 - Disclosure - Events after the reporting period Network

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215 Implied Table Table

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216 Disclosure Of Nonadjusting Events After Reporting Period [Abstract] Abstract ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract
217 Events after the reporting period Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
218 100270 - Disclosure - Accounting principles applied in the preparation of the consolidated financial statements (Policies) Network

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219 Implied Table Table

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220 Disclosure Of Accounting Policy [Abstract] Abstract obsv:DisclosureOfAccountingPolicyAbstract
221 Basis of preparation Concept (Text Block (HTML)) For Period obsv:DescriptionOfAccountingPolicyForBasisOfPreparationExplanatory
222 Scope of consolidation Concept (Text Block (HTML)) For Period obsv:DescriptionOfAccountingPolicyForScopeOfConsolidationExplanatory
223 Standards and interpretations published by the IASB Concept (Text Block (HTML)) For Period obsv:DescriptionOfAccountingPolicyForStandardsAndInterpretationsExplanatory
224 Cash and cash equivalents Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
225 Current assets Concept (Text Block (HTML)) For Period obsv:DescriptionOfAccountingPolicyForCurrentAssetsExplanatory
226 Plant and Equipment Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
227 Intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory
228 Post-employment benefits Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
229 Equity Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIssuedCapitalExplanatory
230 Research and development Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory
231 Foreign currencies Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
232 Share-based compensation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
233 Deferred income taxes Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory
234 Leases Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
235 Segment information Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
236 Critical accounting estimates and judgments Concept (Text Block (HTML)) For Period obsv:DescriptionOfAccountingPolicyForCriticalAccountingEstimatesAndAssumptionsExplanatory
237 100280 - Disclosure - Accounting principles applied in the preparation of the consolidated financial statements (Tables) Network

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238 Implied Table Table

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239 Disclosure Of Accounting Policy [Abstract] Abstract obsv:DisclosureOfAccountingPolicyAbstract
240 Summary of Useful Lives of Furniture Fixtures and Equipment Concept (Text Block (HTML)) For Period obsv:DisclosureOfPropertyPlantAndEquipmentUsefulLivesExplanatory
241 Schedule of Rates Used for Translation from Functional Currency to Presentation Currency Concept (Text Block (HTML)) For Period obsv:DisclosureOfRatesUsedForTranslationFromFunctionalCurrencyToPresentationCurrencyExplanatory
242 Summary of Geographical Analysis of Assets Concept (Text Block (HTML)) For Period obsv:DisclosureOfLongLivedAssetsByGeographicAreasExplanatory
243 Summary of Geographical Analysis of Operating Expenses Concept (Text Block (HTML)) For Period obsv:DisclosureOfOperatingExpenseByGeographicalAreasExplanatory
244 100290 - Disclosure - Financial risk management (Tables) Network

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245 Implied Table Table

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246 Financial Risks Management [Abstract] Abstract obsv:FinancialRisksManagementAbstract
247 Schedule of Sensitivity of Profit or Loss to Changes in Exchange Rates Concept (Text Block (HTML)) For Period ifrs-full:SensitivityAnalysisForEachTypeOfMarketRisk
248 100300 - Disclosure - Cash and cash equivalents (Tables) Network

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249 Implied Table Table

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250 Cash And Cash Equivalents [Abstract] Abstract ifrs-full:CashAndCashEquivalentsAbstract
251 Schedule of Cash and Cash Equivalents Concept (Text Block (HTML)) For Period obsv:DisclosureOfDetailedInformationAboutCashAndCashEquivalentsExplanatory
252 Schedule of Percentage of Bank Held Cash and Cash Equivalents Split by Currency Concept (Text Block (HTML)) For Period obsv:DisclosureOfCashAndCashEquivalentsSplitByCurrencyExplanatory
253 100310 - Disclosure - Prepaid and accrued expenses (Tables) Network

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254 Implied Table Table

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255 Default Root [Abstract] Abstract obsv:DefaultRootAbstract
256 Summary of Accrued Expenses Concept (Text Block (HTML)) For Period obsv:DisclosureOfPrepaidAndAccruedExpensesExplanatory
257 100320 - Disclosure - Furniture, fixtures and equipment (Tables) Network

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258 Implied Table Table

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259 Disclosure Of Property Plant And Equipment [Abstract] Abstract ifrs-full:DisclosureOfPropertyPlantAndEquipmentAbstract
260 Schedule of Furniture, Fixtures and Equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
261 100330 - Disclosure - Intangible assets (Tables) Network

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262 Implied Table Table

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263 Disclosure Of Intangible Assets [Abstract] Abstract ifrs-full:DisclosureOfIntangibleAssetsAbstract
264 Schedule of Detailed Information of Intangible Assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
265 100340 - Disclosure - Post-employment benefits (Tables) Network

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266 Implied Table Table

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267 Disclosure Of Defined Benefit Plans [Abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
268 Schedule of Defined Benefit Plans Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDefinedBenefitPlansExplanatory
269 Schedule of Fair Value of Plan Assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueOfPlanAssetsExplanatory
270 Summary of Components of Defined Benefit Cost Concept (Text Block (HTML)) For Period obsv:DisclosureOfComponentsOfDefinedBenefitCostsExplanatory
271 Summary of Remeasurement Components Recognized in Other Comprehensive Loss Concept (Text Block (HTML)) For Period obsv:DisclosureOfRemeasurementComponentRecognizedOtherComprehensiveIncomeLossExplanatory
272 Summary of Amounts Recognized in Statement of Financial Position Concept (Text Block (HTML)) For Period obsv:DisclosureOfAmountsRecognizedInTheStatementOfFinancialPositionExplanatory
273 Summary of Net Defined Benefit Liability Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetExplanatory
274 Summary of Percentage of Assets Amount Contributed to Fair Value of Plan Assets Concept (Text Block (HTML)) For Period obsv:DisclosureOfPercentageOfAssetsAmountContributedToFairValueOfPlanAssetsExplanatory
275 Summary of Principal Actuarial Assumptions Concept (Text Block (HTML)) For Period obsv:DisclosureOfActuarialAssumptionExplanatory
276 Summary of Sensitivity Analysis of Group Defined Obligation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory
277 100350 - Disclosure - Shareholders' equity (Tables) Network

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278 Implied Table Table

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279 Disclosure Of Classes Of Share Capital [Abstract] Abstract ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
280 Summary of Shareholders' Equity Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory
281 Summary of Authorized Share Capital Concept (Text Block (HTML)) For Period obsv:DisclosureOfAuthorizedShareCapitalExplanatory
282 100360 - Disclosure - Operating expenses by nature (Tables) Network

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283 Implied Table Table

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284 Expense By Nature [Abstract] Abstract ifrs-full:ExpenseByNatureAbstract
285 Schedule of Operating Expenses by Nature Concept (Text Block (HTML)) For Period obsv:DisclosureOfOperatingExpensesExplanatory
286 Summary of Depreciation Expense Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDepreciationAndAmortisationExpenseExplanatory
287 100370 - Disclosure - Staff costs (Tables) Network

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288 Implied Table Table

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289 Disclosure Of Staffing Costs [Abstract] Abstract obsv:DisclosureOfStaffingCostsAbstract
290 Summary of Staff Costs Concept (Text Block (HTML)) For Period obsv:ScheduleOfInformationAboutStaffCostsTextBlock
291 100380 - Disclosure - Income taxes and deferred taxes (Tables) Network

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292 Implied Table Table

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293 Disclosure Of Income Tax [Abstract] Abstract obsv:DisclosureOfIncomeTaxAbstract
294 Schedule of Unrecorded Tax Losses Carry Forwards Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
295 Summary of Difference Between Income Tax Expense at Applicable Group Tax Rate and Effective Income Tax Expense Concept (Text Block (HTML)) For Period obsv:DisclosureOfEffectiveIncomeTaxRateReconciliationExplanatory
296 100390 - Disclosure - Loss per share (Tables) Network

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297 Implied Table Table

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298 Earnings Per Share [Abstract] Abstract ifrs-full:EarningsPerShareAbstract
299 Schedule of Basic and Diluted Loss per Share Concept (Text Block (HTML)) For Period ifrs-full:EarningsPerShareExplanatory
300 100400 - Disclosure - Share-based compensation (Tables) Network

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301 Implied Table Table

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302 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] Abstract ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
303 Schedule of Recognized Share-based Payment Expenses Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory
304 Schedule of Vesting of Shares Concept (Text Block (HTML)) For Period ifrs-full:AdditionalInformationAboutSharebasedPaymentArrangements
305 Movements in Number of Stock-options Outstanding Under 2017 EIP Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory
306 Range of Exercise Prices and Expiry Dates Outstanding Stock-options Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory
307 Significant Inputs to Model to Determine Weighted Average Fair Value of Stock-options Granted Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory
308 100410 - Disclosure - Commitments and contingencies (Tables) Network

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309 Implied Table Table

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310 Disclosure Of Commitments And Contingencies [Abstract] Abstract obsv:DisclosureOfCommitmentsAndContingenciesAbstract
311 Schedule of Operating Lease Commitments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory
312 100420 - Disclosure - Related parties transactions (Tables) Network

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313 Implied Table Table

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314 Disclosure Of Transactions Between Related Parties [Abstract] Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
315 Summary of Total Remuneration Recorded for Members of the Board of Directors and Executive Committee Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesExplanatory
316 100430 - Disclosure - General Information - Additional Information (Detail) Network

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317 Implied Table Table

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318 Disclosure Of General Information About Financial Statements [Abstract] Abstract obsv:DisclosureOfGeneralInformationAboutFinancialStatementsAbstract
319 Name of reporting entity Concept (Text/String) For Period ifrs-full:NameOfReportingEntityOrOtherMeansOfIdentification
320 Date of foundation of entity Concept (Date) For Period dei:EntityIncorporationDateOfIncorporation
321 Country of incorporation Concept (Text/String) For Period ifrs-full:CountryOfIncorporation
322 Details about operations of the entity Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
323 100440 - Disclosure - Accounting Principles Applied in the Preparation of the Consolidated Financial Statements - Additional Information (Detail) Network

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324 Disclosure Of Voluntary Change In Accounting Policy [Table] Table

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326 Ranges [member] Member ifrs-full:RangesMember
327 Top of range [Member] Member ifrs-full:TopOfRangeMember
328 Bottom of range [Member] Member ifrs-full:BottomOfRangeMember
329 Disclosure of voluntary change in accounting policy [Line Items] LineItems ifrs-full:DisclosureOfVoluntaryChangeInAccountingPolicyLineItems
330 non-cancellable operating lease commitments Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
331 Estimated useful life of intangible assets Concept (Text/String) For Period ifrs-full:UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
332 100450 - Disclosure - Accounting Principles Applied in the Preparation of the Consolidated Financial Statements - Summary of Useful Lives of Furniture Fixtures and Equipment (Detail) Network

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333 Disclosure Of Property Plant And Equipment [Table] Table

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334 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
335 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
336 Furniture [Member] Member obsv:FurnitureMember
337 Hardware [Member] Member obsv:HardwareMember
338 Leasehold improvement [Member] Member ifrs-full:LeaseholdImprovementsMember
339 Disclosure of detailed information about property, plant and equipment [Line Items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
340 Useful lives of furniture, fixtures and equipment Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
341 100460 - Disclosure - Accounting Principles Applied in the Preparation of the Consolidated Financial Statements - Schedule of Rates Used for Translation from Functional Currency to Presentation Currency (Detail) Network

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342 Implied Table Table

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343 Foreign Exchange Rates [Abstract] Abstract ifrs-full:ForeignExchangeRatesAbstract
344 Average rate (CHF) Concept (Decimal) For Period ifrs-full:AverageForeignExchangeRate
345 Closing rate (CHF) Concept (Decimal) As Of ifrs-full:ClosingForeignExchangeRate
346 100470 - Disclosure - Accounting Principles Applied in the Preparation of the Consolidated Financial Statements - Summary of Geographical Analysis of Assets (Detail) Network

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347 Disclosure Of Geographical Areas [Table] Table

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349 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
350 Switzerland [Member] Member country:CH
351 USA [Member] Member country:US
352 Disclosure Of Geographical Areas [Line Items] LineItems ifrs-full:DisclosureOfGeographicalAreasLineItems
353 Total non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
354 100480 - Disclosure - Accounting Principles Applied in the Preparation of the Consolidated Financial Statements - Summary of Geographical Analysis of Operating Expenses (Detail) Network

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355 Disclosure Of Geographical Areas [Table] Table

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356 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
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358 Switzerland [Member] Member country:CH
359 USA [Member] Member country:US
360 Disclosure Of Geographical Areas [Line Items] LineItems ifrs-full:DisclosureOfGeographicalAreasLineItems
361 Total operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
362 100490 - Disclosure - Financial Risk Management - Schedule of Sensitivity of Profit or Loss to Changes in Exchange Rates (Detail) Network

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363 Disclosure Of Financial Risk Management [Table] Table

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365 All Currencies Member currency:AllCurrenciesDomain
366 EUR [Member] Member currency:EUR
367 GBP [Member] Member currency:GBP
368 CHF [Member] Member currency:CHF
369 USD [Member] Member currency:USD
370 Disclosure Of Financial Risk Management [Line Items] LineItems obsv:DisclosureOfFinancialRiskManagementLineItems
371 Increase exchange rate vs CHF (2016) and USD (2017) Concept (Percent) For Period obsv:IncreaseInForeignCurrencyExchangeRatePercentage
372 Increase effect on profit before tax Concept (Monetary) For Period Credit ifrs-full:NetForeignExchangeGain
373 Increase effect on shareholders' equity Concept (Monetary) For Period Credit obsv:IncreaseInExchangeRatesEffectOnShareholdersEquity
374 Decrease exchange rate vs CHF (2016) and USD (2017) Concept (Percent) For Period obsv:DecreaseInForeignCurrencyExchangeRatePercentage
375 Decrease effect on profit before tax Concept (Monetary) For Period Debit ifrs-full:NetForeignExchangeLoss
376 Decrease effect on shareholders' equity Concept (Monetary) For Period Debit obsv:DecreaseInExchangeRatesEffectOnShareholdersEquity
377 100500 - Disclosure - Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Detail) Network

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378 Implied Table Table

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379 Cash And Cash Equivalents [Abstract] Abstract ifrs-full:CashAndCashEquivalentsAbstract
380 Bank deposits Concept (Monetary) As Of Debit ifrs-full:BalancesWithBanks
381 Interest bearing deposits Concept (Monetary) As Of Debit ifrs-full:ShorttermDepositsClassifiedAsCashEquivalents
382 Total cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
383 100510 - Disclosure - Cash and Cash Equivalents - Schedule of Percentage of Bank Held Cash and Cash Equivalents Split by Currency (Detail) Network

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384 Disclosure Of Cash And Cash Equivalents [Table] Table

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386 All Currencies Member currency:AllCurrenciesDomain
387 CHF [Member] Member currency:CHF
388 USD [Member] Member currency:USD
389 EUR [Member] Member currency:EUR
390 GBP [Member] Member currency:GBP
391 Disclosure of cash and cash equivalents [Line Items] LineItems obsv:DisclosureOfCashAndCashEquivalentsLineItems
392 Percentage of bank held cash and cash equivalents Concept (Percent) For Period obsv:PercentageOfCashAndCashEquivalents
393 100520 - Disclosure - Receivables and Payables - Additional Information (Detail) Network

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394 Disclosure Of Receivables And Payables [Table] Table

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396 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
397 Within 1 year [Member] Member ifrs-full:NotLaterThanOneYearMember
398 Disclosure of receivables and payables [line items] LineItems obsv:DisclosureOfReceivablesAndPayablesLineItems
399 Contractual maturity of payables Concept (xbrli:durationItemType) For Period obsv:ContractualMaturityOfPayables
400 100530 - Disclosure - Prepaid and accrued expenses - Additional Information (Detail) Network

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401 Prepaid And Accrued Expenses [Table] Table

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402 Assets and liabilities [axis] Axis ifrs-full:AssetsAndLiabilitiesAxis
403 Assets and liabilities [member] Member ifrs-full:AssetsAndLiabilitiesMember
404 Upfront Payments [Member] Member obsv:UpfrontPaymentsMember
405 Prepaid And Accrued Expenses [Line Items] LineItems obsv:PrepaidAndAccruedExpensesLineItems
406 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
407 100540 - Disclosure - Schedule of Accrued Expenses (Detail) Network

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408 Implied Table Table

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409 Disclosure Of Accrued Expenses [Abstract] Abstract obsv:DisclosureOfAccruedExpensesAbstract
410 Accrued research and development expenses Concept (Monetary) As Of Debit obsv:AccruedResearchAndDevelopmentExpenses
411 Accrued compensation-related expenses Concept (Monetary) As Of Debit obsv:AccruedCompensationRelatedExpenses
412 Accrued other expenses Concept (Monetary) As Of Debit obsv:AccruedOtherExpenses
413 Accrued expenses Concept (Monetary) As Of Credit ifrs-full:CurrentAccruedExpensesAndOtherCurrentLiabilities
414 100550 - Disclosure - Furniture, Fixtures and Equipment - Schedule of Furniture, Fixtures and Equipment (Detail) Network

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415 Disclosure Of Property Plant And Equipment [Table] Table

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416 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
417 Carrying amount [member] Member ifrs-full:CarryingAmountMember
418 Total cost [Member] Member ifrs-full:GrossCarryingAmountMember
419 Accumulated depreciation and amortization [Member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
420 Disclosure of detailed information about property, plant and equipment [Line Items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
421 Furniture, fixtures and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
422 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
423 Depreciation charge Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
424 Currency translation effects Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment
425 Furniture, fixtures and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
426 100560 - Disclosure - Intangible Assets - Schedule of Intangible Assets (Details) Network

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427 Disclosure Of Intangible Assets [Table] Table

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428 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
429 Carrying amount [member] Member ifrs-full:CarryingAmountMember
430 Total cost [Member] Member ifrs-full:GrossCarryingAmountMember
431 Accumulated depreciation and amortization [Member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
432 Disclosure of detailed information about intangible assets [Line Items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
433 Net book value as at the beginning of the year Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
434 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
435 Amortization charge Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
436 Currency translation effects Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill
437 Net book value as at the end of the year Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
438 100570 - Disclosure - Intangible Assets - Additional Information (Detail) Network

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439 Disclosure Of Intangible Assets [Table] Table

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440 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
441 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
442 Merck Serono Licenses [Member] Member obsv:MerckSeronoLicensesMember
443 Kissei License [Member] Member obsv:KisseiLicenseMember
444 Disclosure of detailed information about intangible assets [Line Items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
445 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
446 Purchase of intangible assets Concept (Monetary) For Period Credit ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities
447 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
448 Upfront cash consideration to acquire in-license Concept (Monetary) For Period Credit obsv:PaymentOfUpfrontCashConsideration
449 Recognition and payment of milestone amount Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesIntangibleAssetsOtherThanGoodwill
450 Impairment loss Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill
451 Length of development cycle for intangible assets Concept (xbrli:durationItemType) For Period obsv:IntangibleAssetsOtherThanGoodwillEstimatedUsefulLife
452 Discount factor based on assumed cost of capital Concept (Percent) For Period obsv:AmortizationRatesIntangibleAssetsOtherThanGoodwill
453 100580 - Disclosure - Post- Employment Benefits - Schedule of Defined Benefit Plans (Detail) Network

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454 Disclosure Of Defined Benefit Plans [Table] Table

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455 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
456 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
457 Present value of defined benefit obligation [Member] Member ifrs-full:PresentValueOfDefinedBenefitObligationMember
458 Disclosure Of Defined Benefit Plans [Line Items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
459 Change in defined benefit obligation Abstract ifrs-full:ChangesInNetDefinedBenefitLiabilityAssetAbstract
460 Defined benefit obligation beginning balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
461 Current service cost Concept (Monetary) For Period Credit ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset
462 Interest cost Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
463 Net benefits paid Concept (Monetary) For Period Debit ifrs-full:PaymentsFromPlanNetDefinedBenefitLiabilityAsset
464 Currency translation effects Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset
465 Remeasurements: Abstract ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract
466 Impact of plan amendment Concept (Monetary) For Period Debit obsv:PlanAmendmentsNetDefinedBenefitLiabilityAsset
467 Effect of changes in demographic assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset
468 Effect of changes in financial assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
469 Effect in experience assumptions Concept (Monetary) For Period Debit ifrs-full:GainLossOnChangesInEffectOfLimitingNetDefinedBenefitAssetToAssetCeiling
470 Defined benefit obligation ending balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
471 100590 - Disclosure - Post- Employment Benefits - Schedule of Fair Value of Plan Assets (Detail) Network

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472 Disclosure Of Defined Benefit Plans [Table] Table

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473 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
474 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
475 Plan assets [Member] Member ifrs-full:PlanAssetsMember
476 Disclosure Of Defined Benefit Plans [Line Items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
477 Change in plan assets Abstract obsv:ChangesInPlanAssetsAbstract
478 Fair value of plan assets, beginning balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
479 Interest income Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss
480 Employer contributions Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset
481 Employee contributions Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAsset
482 Net benefits paid Concept (Monetary) For Period Debit ifrs-full:PaymentsFromPlanNetDefinedBenefitLiabilityAsset
483 Currency translation effects Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset
484 Remeasurements: return on plan assets (excluding interest income) Concept (Monetary) For Period Debit ifrs-full:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset
485 Fair value of plan assets, ending balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
486 100600 - Disclosure - Post- Employment Benefits - Summary of Components of Defined Benefit Cost (Detail) Network

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487 Implied Table Table

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488 Disclosure Of Defined Benefit Plans [Abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
489 Components of defined benefit cost Abstract obsv:ComponentsOfDefinedBenefitCostAbstract
490 Current service cost Concept (Monetary) For Period Credit ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset
491 Interest cost Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
492 Interest income on plan assets Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss
493 Employee contributions Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAsset
494 Impact of plan amendment Concept (Monetary) For Period Debit obsv:PlanAmendmentsNetDefinedBenefitLiabilityAsset
495 Total included in staff costs Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInNetDefinedBenefitLiabilityAsset
496 100610 - Disclosure - Post- Employment Benefits - Summary of Remeasurement Components Recognized in Other Comprehensive Loss (Detail) Network

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497 Implied Table Table

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498 Disclosure Of Remeasurement Amounts Recognized In Other Comprehensive Income Loss [Abstract] Abstract obsv:DisclosureOfRemeasurementAmountsRecognizedInOtherComprehensiveIncomeLossAbstract
499 Remeasurements recognized in other comprehensive loss Abstract ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract
500 Effect of changes in demographic assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset
501 Effect of changes in financial assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
502 Effect in experience assumptions Concept (Monetary) For Period Debit ifrs-full:GainLossOnChangesInEffectOfLimitingNetDefinedBenefitAssetToAssetCeiling
503 Return on plan assets (excluding interest income) Concept (Monetary) For Period Debit ifrs-full:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset
504 Total remeasurements recognized as other comprehensive loss Concept (Monetary) For Period Debit ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
505 Cumulative amount of remeasurements immediately recognized in other comprehensive loss Concept (Monetary) As Of Credit obsv:CumulativeAmountOfRemeasurementsImmediatelyRecognizedInOtherComprehensiveLoss
506 100620 - Disclosure - Post- Employment Benefits - Summary of Amounts Recognized in Statement of Financial Position (Detail) Network

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507 Implied Table Table

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508 Disclosure Of Amounts Recognized In Balance Sheet [Abstract] Abstract obsv:DisclosureOfAmountsRecognizedInBalanceSheetAbstract
509 Amounts recognized in the statement of financial position Abstract obsv:AmountRecognizedInBalanceSheetAbstract
510 Defined benefit obligation Concept (Monetary) As Of Credit ifrs-full:DefinedBenefitObligationAtPresentValue
511 Fair value of plan assets Concept (Monetary) As Of Debit ifrs-full:PlanAssetsAtFairValue
512 Net liability Concept (Monetary) As Of Debit ifrs-full:SurplusDeficitInPlan
513 100630 - Disclosure - Post- Employment Benefits - Summary of Net Defined Benefit Liability (Detail) Network

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514 Implied Table Table

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515 Disclosure Of Net Defined Benefit Liability Asset [Abstract] Abstract ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetAbstract
516 Change in defined benefit liability Abstract ifrs-full:ChangesInNetDefinedBenefitLiabilityAssetAbstract
517 Fair value of plan assets, beginning balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
518 Defined benefit cost included in statement of comprehensive loss Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInNetDefinedBenefitLiabilityAsset
519 Total remeasurements included in other comprehensive loss Concept (Monetary) For Period Debit ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
520 Employer contributions Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset
521 Currency translation effects Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset
522 Fair value of plan assets, ending balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
523 100640 - Disclosure - Post- Employment Benefits - Summary of Percentage of Assets Amount Contributed to Fair Value of Plan Assets (Detail) Network

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524 Implied Table Table

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525 Percentage Of Assets Amount Contributed To Fair Value Of Plan Assets [Abstract] Abstract obsv:PercentageOfAssetsAmountContributedToFairValueOfPlanAssetsAbstract
526 Cash Concept (Percent) As Of obsv:PercentageOfCashAndCashEquivalentsAmountContributedToFairValueOfPlanAssets
527 Bonds Concept (Percent) For Period obsv:PercentageOfBondsAmountContributedToFairValueOfPlanAssets
528 Shares Concept (Percent) For Period obsv:PercentageOfSharesAmountContributedToFairValueOfPlanAssets
529 Real estate Concept (Percent) As Of obsv:PercentageOfRealEstateAmountContributedToFairValueOfPlanAssets
530 Mortgages Concept (Percent) For Period obsv:PercentageOfMortgagesAmountContributedToFairValueOfPlanAssets
531 Alternative investments Concept (Percent) For Period obsv:PercentageOfAlternativeInvestmentsAmountContributedToFairValueOfPlanAssets
532 Total Concept (Percent) As Of obsv:PercentageOfAssetsAmountContributedToFairValueOfPlanAssets
533 100650 - Disclosure - Post- Employment Benefits - Summary of Principal Actuarial Assumptions (Detail) Network

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534 Implied Table Table

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535 Disclosure Of Defined Benefit Plans [Abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
536 Discount rate Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfDiscountRates
537 Salary increase (including inflation) Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
538 Rate of pension increases Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfExpectedRatesOfPensionIncreases
539 Post-employment mortality table Concept (Text/String) For Period obsv:DescriptionOfActuarialAssumptionOfMortality
540 100660 - Disclosure - Post-Employment Benefits - Summary of Sensitivity Analysis of Group Defined Obligation (Detail) Network

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541 Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Table] Table

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542 Actuarial assumptions [axis] Axis ifrs-full:ActuarialAssumptionsAxis
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544 Discount rate plus 50bps [Member] Member obsv:DiscountRatePlusFiftyBasisPointsMember
545 Discount rate minus 50bps [Member] Member obsv:DiscountRateMinusFiftyBasisPointsMember
546 Salary increase plus 50bps [Member] Member obsv:SalaryIncreasePlusFiftyBasisPointsMember
547 Salary increase minus 50bps [Member] Member obsv:SalaryIncreaseMinusFiftyBasisPointsMember
548 Rate of pension increase plus 25bps [Member] Member obsv:RateOfPensionIncreasePlusTwentyFiveBasisPointsMember
549 Rate of pension increase minus 25 bps [Member] Member obsv:RateOfPensionIncreaseMinusTwentyFiveBasisPointsMember
550 Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items] LineItems ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
551 Sensitivity analysis Concept (Text/String) For Period ifrs-full:DescriptionOfChangesInMethodsAndAssumptionsUsedInPreparingSensitivityAnalysisForActuarialAssumptions
552 Discount rate Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfDiscountRates
553 Salary increase Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
554 Rate of pension increases Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfExpectedRatesOfPensionIncreases
555 Defined benefit obligation Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption
556 Average duration of the defined benefit obligation Concept (xbrli:durationItemType) For Period obsv:SensitivityAnalysisForAverageDurationOfDefinedBenefitObligations
557 100670 - Disclosure - Post-employment Benefits - Additional Information (Detail) Network

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558 Disclosure Of Defined Benefit Plans [Table] Table

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560 Defined benefit plans [member] Member ifrs-full:DefinedBenefitPlansMember
561 Post-employment benefit plans [Member] Member obsv:PostEmploymentPlanMember
562 Disclosure Of Defined Benefit Plans [Line Items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
563 Expected contributions paid by employer under post-employment benefit plans Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset
564 100680 - Disclosure - Shareholders' Equity - Summary of Shareholders' Equity (Detail) Network

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565 Disclosure Of Classes Of Share Capital [Table] Table

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567 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
568 Common shares [Member] Member ifrs-full:OrdinarySharesMember
569 Preferred A shares [Member] Member obsv:PreferredASharesMember
570 Preferred B shares [Member] Member obsv:PreferredBSharesMember
571 Non voting shares [Member] Member obsv:NonVotingSharesMember
572 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
573 Equity [member] Member ifrs-full:EquityMember
574 Share capital [Member] Member ifrs-full:IssuedCapitalMember
575 Share premium [Member] Member ifrs-full:SharePremiumMember
576 Total [Member] Member obsv:IssuedCapitalAndSharePremiumMember
577 Disclosure of classes of share capital [Line Items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
578 Beginning balance Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
579 Conversion of preferred and non-voting shares Concept (Shares) For Period obsv:ConversionOfPreferredAndNonVotingShares
580 Issuance of shares - IPO Concept (Shares) For Period obsv:IssuanceOfSharesUnderInitialPublicOffering
581 Issuance of shares - PIPE Concept (Shares) For Period obsv:ShareIssuedThroughPrivateInvestmentInPublicEquities
582 Issuance of shares - Incentive Plan Concept (Shares) For Period obsv:ShareIssuedThroughEmployeeStockIncentivePlan
583 Issuance of shares - June 2018 offering Concept (Shares) For Period obsv:UnderwrittenPublicOffering
584 Issuance of shares - ATM program Concept (Shares) For Period obsv:ShareIssuedThroughAtMarketProgram
585 Share issuance costs Concept (Shares) For Period obsv:ShareIssuanceCostNumberOfShares
586 Exercise of stock-options Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
587 Ending balance Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
588 Equity, beginning balance Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
589 Conversion of preferred and non-voting shares, value Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughConversionOfConvertibleInstruments
590 Issuance of shares - IPO- value Concept (Monetary) For Period Credit obsv:IssuanceOfSharesValueUnderInitialPublicOffering
591 Issuance of shares - PIPE, value Concept (Monetary) For Period Credit obsv:StockIssuedDuringPeriodValuePrivateInvestmentInPublicEquities
592 Issuance of shares - Incentive Plan, value Concept (Monetary) For Period Credit obsv:IncreaseOrDecreaseThroughIssuanceOfSharesEmployeeStockIncentivePlan
593 Issuance of shares - June 2018 offering, value Concept (Monetary) For Period Credit obsv:UnderwrittenPublicOfferingValue
594 Issuance of shares - ATM program, value Concept (Monetary) For Period Credit obsv:StockIssuedDuringValueAtMarketProgram
595 Share issuance costs Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
596 Exercise of stock-options, value Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
597 Equity, ending balance Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
598 100690 - Disclosure - Shareholders' Equity - Additional Information (Detail) Network

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599 Disclosure Of Classes Of Share Capital [Table] Table

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600 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
601 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
602 Common shares [Member] Member ifrs-full:OrdinarySharesMember
603 IPO [Member] Member obsv:InitialPublicOfferingMember
604 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
605 Equity [member] Member ifrs-full:EquityMember
606 Treasury Shares [Member] Member ifrs-full:TreasurySharesMember
607 Capital requirements [axis] Axis ifrs-full:CapitalRequirementsAxis
608 Capital requirements [member] Member ifrs-full:CapitalRequirementsMember
609 Underwritten public offering [Member] Member obsv:UnderwrittenPublicOfferingMember
610 Follow-on offering [Member] Member obsv:FollowOnOfferingMember
611 Green-shoe [Member] Member obsv:GreenShoeMember
612 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
613 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
614 2013 Equity Incentive Plan [Member] Member obsv:TwoThousandThirteenEquityIncentivePlanMember
615 Disclosure of classes of share capital [Line Items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
616 Share capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
617 Number of shares issued and fully paid Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
618 Treasury non-voting shares Concept (Shares) As Of us-gaap:TreasuryStockShares
619 Issuance Of Issuance Of Non Vested Non Voting Shares Fully Paid Concept (Shares) For Period obsv:IssuanceOfIssuanceOfNonVestedNonVotingSharesFullyPaid
620 Nominal value per share of non-voting shares Concept (Share) As Of obsv:NominalValuePerShare
621 Issuance of shares - IPO Concept (Shares) For Period obsv:IssuanceOfNonVotingSharesToEmployeesSharesFullyPaid
622 Par value per share Concept (Share) For Period obsv:InitialPublicOfferingShareIssuePrice
623 Nominal value per share of non-voting shares Concept (Share) As Of ifrs-full:ParValuePerShare
624 Proceeds from issue of common shares Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfOrdinaryShares
625 Share issue related cost Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
626 Issuance of shares Concept (Shares) As Of obsv:NumberOfSharesIssuedPrivatePlacement
627 Par value per share Concept (Share) As Of obsv:PrivatePlacementShareIssuePrice
628 Share issue related cost Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
629 Number of shares issued Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
630 Share price Concept (Share) As Of obsv:ShareIssuePrice
631 Proceeds from sale of treasury shares Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSaleOrIssueOfTreasuryShares
632 Issuance of shares Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
633 100700 - Disclosure - Shareholders' Equity - Summary of Authorized Share Capital (Detail) Network

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634 Implied Table Table

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635 Disclosure Of Authorized Share Capital [Abstract] Abstract obsv:DisclosureOfAuthorizedShareCapitalAbstract
636 Authorized share capital Concept (Shares) As Of obsv:AuthorizedVotingShareCapital
637 100710 - Disclosure - Revenue and Other Income - Additional Information (Detail) Network

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638 Implied Table Table

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639 Other Long Term Assets [Abstract] Abstract obsv:OtherLongTermAssetsAbstract
640 Revenue and other income [Abstract] Abstract obsv:RevenueAndOtherIncomeAbstract
641 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
642 100720 - Disclosure - Operating Expenses by Nature - Schedule of Operating Expenses by Nature (Detail) Network

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643 Implied Table Table

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644 Expense By Nature [Abstract] Abstract ifrs-full:ExpenseByNatureAbstract
645 External research and development costs Concept (Monetary) For Period Debit obsv:ExternalResearchAndDevelopmentExpense
646 Staff costs (note 14) Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
647 Professional fees Concept (Monetary) For Period Debit ifrs-full:ProfessionalFeesExpense
648 Rents Concept (Monetary) For Period Debit ifrs-full:RentalExpense
649 Travel expenses Concept (Monetary) For Period Debit ifrs-full:TravelExpense
650 Patent registration costs Concept (Monetary) For Period Debit obsv:PatentCosts
651 Depreciation Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
652 Other Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
653 Total operating expenses by nature Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
654 100730 - Disclosure - Operating Expenses by Nature - Additional Information (Detail) Network

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655 Implied Table Table

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656 Expense By Nature [Abstract] Abstract ifrs-full:ExpenseByNatureAbstract
657 Research and development expense Concept (Monetary) For Period Debit ifrs-full:ResearchAndDevelopmentExpense
658 100740 - Disclosure - Operating Expenses by Nature - Summary of Depreciation Expense (Detail) Network

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659 Disclosure Of Depreciation Expense [Table] Table

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660 Statement Of Comprehensive Income Profit Or Loss Location Axis obsv:StatementOfComprehensiveIncomeProfitOrLossLocationAxis
661 Statement Of Comprehensive Income Profit Or Loss Location Member obsv:StatementOfComprehensiveIncomeProfitOrLossLocationDomain
662 Research and development expenses [Member] Member obsv:ResearchAndDevelopmentExpensesMember
663 General and administrative expenses [Member] Member obsv:GeneralAndAdministrativeExpensesMember
664 Disclosure Of Depreciation Expense [Line Items] LineItems obsv:DisclosureOfDepreciationExpenseLineItems
665 Total depreciation Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
666 100750 - Disclosure - Staff Costs - Summary of Staff Costs (Detail) Network

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667 Implied Table Table

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668 Disclosure Of Defined Benefit Plans [Abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
669 Wages and salaries Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
670 Social charges Concept (Monetary) For Period Debit ifrs-full:SocialSecurityContributions
671 Post-employment benefits expense Concept (Monetary) For Period Debit obsv:PostemploymentBenefitExpenseDefinedBenefitPlansAndDefinedContributionPlans
672 Share-based payments Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
673 Total staff costs Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
674 100760 - Disclosure - Staff Costs - Additional Information (Detail) Network

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675 Implied Table Table

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676 Analysis Of Income And Expense [Abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
677 Average employed on full-time equivalents Concept (Decimal) For Period ifrs-full:AverageNumberOfEmployees
678 Employed on full-time equivalents Concept (Decimal) As Of ifrs-full:NumberOfEmployees
679 Gain on post-employment benefits Concept (Monetary) For Period Credit obsv:GainRelatingToPlanEnacted
680 100770 - Disclosure - Income Taxes and Deferred Taxes - Additional Information (Detail) Network

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681 Disclosure Of Income Tax [Table] Table

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682 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
683 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
684 Switzerland [Member] Member country:CH
685 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
686 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
687 Municipal and Cantonal Tax Rate [Member] Member obsv:MunicipalAndCantonalTaxRateMember
688 Federal Tax Rate [Member] Member obsv:FederalTaxRateMember
689 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
690 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
691 ObsEva Ireland Ltd [Member] Member obsv:ObsEvaIrelandLtdMember
692 ObsEva USA Inc [Member] Member obsv:ObsEvaUSAIncMember
693 Disclosure Of Income Tax [Line Items] LineItems obsv:DisclosureOfIncomeTaxLineItems
694 Disclosure of Income Tax [Abstract] Abstract obsv:DisclosureOfIncomeTaxAbstract
695 Statutory tax rate (blended at Group level) Concept (Percent) For Period ifrs-full:ApplicableTaxRate
696 Tax loss carryforward period Concept (xbrli:durationItemType) For Period obsv:TaxLossCarryforwardPeriod
697 Current tax expense (income) Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
698 Deferred taxes Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
699 100780 - Disclosure - Income Taxes and Deferred Taxes - Schedule of Unrecorded Tax Losses Carry Forwards (Detail) Network

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700 Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Table] Table

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701 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
702 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
703 2020 [Member] Member obsv:TwoThousandTwentyMember
704 2021 [Member] Member obsv:TwoThousandTwentyOneMember
705 2022 [Member] Member obsv:TwoThousandTwentyTwoMember
706 2023 [Member] Member obsv:TwoThousandTwentyThreeMember
707 2024 [Member] Member obsv:TwoThousandTwentyFourMember
708 2025 [Member] Member obsv:TwoThousandTwentyFiveMember
709 Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
710 Total unrecorded tax losses carry forwards Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
711 100790 - Disclosure - Income Taxes and Deferred Taxes - Summary of Difference Between Income Tax Expense at Applicable Group Tax Rate and Effective Income Tax Expense (Detail) Network

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712 Disclosure Of Income Tax [Table] Table

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713 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
714 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
715 ObsEva USA Inc [Member] Member obsv:ObsEvaUSAIncMember
716 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
717 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
718 ObsEva SA Member] Member ifrs-full:ParentMember
719 Disclosure Of Income Tax [Line Items] LineItems obsv:DisclosureOfIncomeTaxLineItems
720 Net loss before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
721 Statutory tax rate (blended at Group level) Concept (Percent) For Period ifrs-full:ApplicableTaxRate
722 Income tax credit at statutory tax rates Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
723 Tax impact of permanent differences Concept (Monetary) For Period Debit obsv:TaxImpactOfPermanentDifferences
724 Temporary differences not recognized as deferred tax assets Concept (Monetary) For Period Debit obsv:TaxImpactOfTemporaryDifferences
725 Adjustments for current tax of prior periods Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForCurrentTaxOfPriorPeriod
726 Tax on losses not recognized as deferred tax assets Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfTaxLosses
727 Effective income tax (credit) expense. Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
728 Effective tax rate Concept (Percent) For Period ifrs-full:AverageEffectiveTaxRate
729 100800 - Disclosure - Loss Per Share - Additional Information (Detail) Network

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730 Implied Table Table

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731 Earnings Per Share [Abstract] Abstract ifrs-full:EarningsPerShareAbstract
732 IPO closing date Concept (Date) For Period obsv:InitialPublicOfferClosingDate
733 Anti-dilutive non-vested securities excluded from calculation of diluted earnings per share Concept (Shares) For Period obsv:InstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShare
734 Anti-dilutive impact of share options on calculation of the diluted earnings per share excluded from calculation Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
735 100810 - Disclosure - Loss Per Share - Schedule of Basic and Diluted Loss per Share (Detail) Network

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736 Earnings Per Share [Table] Table

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737 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
738 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
739 Common shares [Member] Member ifrs-full:OrdinarySharesMember
740 Preferred B shares [Member] Member obsv:PreferredBSharesMember
741 Preferred A shares [Member] Member obsv:PreferredASharesMember
742 Common And Nonvoting Shares Member obsv:CommonAndNonvotingSharesMember
743 Earnings per share [Line Items] LineItems ifrs-full:EarningsPerShareLineItems
744 Net loss attributable to shareholders Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperationsAttributableToOrdinaryEquityHoldersOfParentEntity
745 Weighted average number of shares outstanding Concept (Shares) For Period ifrs-full:WeightedAverageShares
746 Basic and diluted loss per share Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShareFromContinuingOperations
747 100820 - Disclosure - Share-based Compensation - Schedule of Recognized Share-based Payment Expenses (Detail) Network

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748 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table] Table

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749 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
750 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
751 Employee 2013 EIP [Member] Member obsv:EmployeeEquityIncentivePlanTwoThousandAndThirteenMember
752 Employee 2017 EIP [Member] Member obsv:EmployeeEquityIncentivePlanTwoThousandAndSeventeenMember
753 Disclosure of terms and conditions of share-based payment arrangement [Line Items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
754 Total share-based compensation Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
755 100830 - Disclosure - Share-based Compensation - Additional Information (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureShareBasedCompensationAdditionalInformationDetail
756 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table] Table

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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
757 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
758 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
759 Employee 2013 EIP [Member] Member obsv:EmployeeEquityIncentivePlanTwoThousandAndThirteenMember
760 Employee 2017 EIP [Member] Member obsv:EmployeeEquityIncentivePlanTwoThousandAndSeventeenMember
761 Valuation techniques used in fair value measurement [axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
762 Valuation techniques [member] Member ifrs-full:ValuationTechniquesMember
763 Black-Scholes Model [Member] Member obsv:BlackScholesModelMember
764 Disclosure of terms and conditions of share-based payment arrangement [Line Items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
765 Description of method of settlement for share-based payment arrangement Concept (Text/String) For Period ifrs-full:DescriptionOfMethodOfSettlementForSharebasedPaymentArrangement
766 Description of vesting requirements for share-based payment arrangement Concept (Text/String) For Period ifrs-full:DescriptionOfVestingRequirementsForSharebasedPaymentArrangement
767 Obligation to repurchase or settle shares Concept (Monetary) For Period Credit obsv:RepurchaseOrSettlementOfSharesInCash
768 Number of stock option, granted Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
769 Weighted average share price at date of exercise of options exercised Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsInSharebasedPaymentArrangementExercisedDuringPeriodAtDateOfExercise
770 Description of option pricing model, share options granted Concept (Text/String) For Period ifrs-full:DescriptionOfOptionPricingModelShareOptionsGranted
771 weighted average fair value of the stock-options granted Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted
772 100840 - Disclosure - Share-based Compensation - Schedule of Vesting of Shares (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureShareBasedCompensationScheduleOfVestingOfSharesDetail
773 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table] Table

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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
774 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
775 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
776 Employee 2013 EIP [Member] Member obsv:EmployeeEquityIncentivePlanTwoThousandAndThirteenMember
777 Disclosure of terms and conditions of share-based payment arrangement [Line Items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
778 Number of shares issued under the 2013 EIP Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
779 Average grant date fair value (in USD) Concept (Share) For Period obsv:WeightedAverageSharePriceShareOptionsGrantedPerShare
780 Share-based payments Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
781 100850 - Disclosure - Share-based Compensation - Movements in Number of Stock-options Outstanding Under 2017 EIP (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureShareBasedCompensationMovementsInNumberOfStockOptionsOutstandingUnder2017EIPDetail
782 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table] Table

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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
783 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
784 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
785 Employee 2017 EIP [Member] Member obsv:EmployeeEquityIncentivePlanTwoThousandAndSeventeenMember
786 Disclosure of terms and conditions of share-based payment arrangement [Line Items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
787 At January 1, Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
788 Granted Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
789 Forfeited Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
790 Exercised Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
791 At December 31, Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
792 At January 1, average exercise price Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
793 Granted, average exercise price Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
794 Forfeited, average exercise price Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
795 Exercised, average exercise price Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
796 At December 31, average exercise price Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
797 100860 - Disclosure - Share-based Compensation - Range of Exercise Prices and Expiry Dates Outstanding Stock-options (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureShareBasedCompensationRangeOfExercisePricesAndExpiryDatesOutstandingStockOptionsDetail
798 Disclosure Of Range Of Exercise Prices Of Outstanding Share Options [Table] Table

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 ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable
799 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
800 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
801 Employee 2017 EIP [Member] Member obsv:EmployeeEquityIncentivePlanTwoThousandAndSeventeenMember
802 Maturity [axis] Axis ifrs-full:MaturityAxis
803 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
804 Expiration Date 1 [Member] Member obsv:ExpirationDate1Member
805 Expiration Date 2 [Member] Member obsv:ExpirationDate2Member
806 Ranges of exercise prices for outstanding share options [axis] Axis ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsAxis
807 Ranges of exercise prices for outstanding share options [member] Member ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsMember
808 15.00 to 17.99 [Member] Member obsv:ExercisePriceFifteenPointZeroZeroToSeventeenPointNineNineMember
809 12.00 to 14.99 [Member] Member obsv:ExercisePriceTwelvePointZeroZeroToFourteenPointNineNineMember
810 9.00 to 11.99 [Member] Member obsv:ExercisePriceNinePointZeroZeroToElevenPointNineNineMember
811 6.00 to 8.99 [Member] Member obsv:ExercisePriceSixPointZeroZeroToEightPointNineNineMember
812 18.00 to 20.99 [Member] Member obsv:ExercisePriceEighteenPointZeroZeroToTwentyPointNineNineMember
813 Range [axis] Axis ifrs-full:RangeAxis
814 Ranges [member] Member ifrs-full:RangesMember
815 Bottom of range [Member] Member ifrs-full:BottomOfRangeMember
816 Top of range [Member] Member ifrs-full:TopOfRangeMember
817 Disclosure Of Range Of Exercise Prices Of Outstanding Share Options [Line Items] LineItems ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems
818 Expiration date Concept (Year) For Period obsv:YearOfExpiryOfOptionsGranted
819 Range of exercise prices Concept (Monetary) As Of ifrs-full:ExercisePriceOfOutstandingShareOptions
820 Total outstanding options Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
821 Total outstanding options out of which are exercisable Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
822 Weighted-average remaining contractual life (in years) Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
823 100870 - Disclosure - Share-based Compensation - Significant Inputs to Model to Determine Weighted Average Fair Value of Stock-options Granted (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureShareBasedCompensationSignificantInputsToModelToDetermineWeightedAverageFairValueOfStockOptionsGrantedDetail
824 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table] Table

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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
825 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
826 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
827 Employee 2017 EIP [Member] Member obsv:EmployeeEquityIncentivePlanTwoThousandAndSeventeenMember
828 Disclosure of terms and conditions of share-based payment arrangement [Line Items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
829 Weighted average share price at grant date Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
830 Weighted average exercise price Concept (Monetary) For Period ifrs-full:ExercisePriceShareOptionsGranted
831 Weighted average 10-year volatility Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
832 Dividend yield Concept (Percent) For Period ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
833 Weighted average 10-year risk free rate Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
834 100880 - Disclosure - Share-based Compensation - Significant Inputs to Model to Determine Weighted Average Fair Value of Stock-options Granted (Parenthetical) (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureShareBasedCompensationSignificantInputsToModelToDetermineWeightedAverageFairValueOfStockOptionsGrantedParentheticalDetail
835 Implied Table Table

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 implied:Table
836 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] Abstract ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
837 Weighted average volatility period Concept (xbrli:durationItemType) For Period obsv:PeriodOfExpectedVolatilityShareOptionsGranted
838 Weighted average risk free period Concept (xbrli:durationItemType) For Period obsv:PeriodOfRiskFreeInterestRateShareOptionsGranted
839 100890 - Disclosure - Commitments and Contingencies - Schedule of Operating Lease Commitments (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfOperatingLeaseCommitmentsDetail
840 Disclosure Of Commitments And Contingencies [Table] Table

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 obsv:DisclosureOfCommitmentsAndContingenciesTable
841 Maturity [axis] Axis ifrs-full:MaturityAxis
842 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
843 Within 1 year [Member] Member ifrs-full:NotLaterThanOneYearMember
844 Later than 1 year and not later than 5 years [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
845 Later than 5 years [member] Member ifrs-full:LaterThanFiveYearsMember
846 Disclosure of Commitments and Contingencies [Line Items] LineItems obsv:DisclosureOfCommitmentsAndContingenciesLineItems
847 Total operating lease commitments Concept (Monetary) For Period Debit ifrs-full:MinimumOperatingLeasePayments
848 100900 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail
849 Disclosure Of Commitments And Contingencies [Table] Table

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 obsv:DisclosureOfCommitmentsAndContingenciesTable
850 Range [axis] Axis ifrs-full:RangeAxis
851 Ranges [member] Member ifrs-full:RangesMember
852 Bottom of range [Member] Member ifrs-full:BottomOfRangeMember
853 Top of range [Member] Member ifrs-full:TopOfRangeMember
854 Disclosure of Commitments and Contingencies [Line Items] LineItems obsv:DisclosureOfCommitmentsAndContingenciesLineItems
855 License and supply agreement, potential undiscounted future payments Concept (Monetary) For Period Debit obsv:PotentialUndiscountedFutureMilestonePaymentsToBePaidOnLicenseAndSupplyAgreement
856 License and supply agreement, undiscounted amount paid Concept (Monetary) For Period Debit obsv:UndiscountedFutureMilestoneSettledAmountLicenseAndSupplyAgreement
857 Royalty payment as a percentage of net sales Concept (Percent) For Period obsv:RoyaltyPaymentAsPercentageOfNetSales
858 Royalty expiration period from the date of first commercial sale Concept (xbrli:durationItemType) For Period obsv:RoyaltyExpirationPeriodFromDateOfFirstCommercialSaleOfProduct
859 100910 - Disclosure - Related Parties Transactions - Additional Information (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureRelatedPartiesTransactionsAdditionalInformationDetail
860 Disclosure Of Transactions Between Related Parties [Table] Table

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 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
861 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
862 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
863 Other Related Parties [Member] Member ifrs-full:OtherRelatedPartiesMember
864 Disclosure of transactions between related parties [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
865 Number of directors Concept (Integer) For Period obsv:NumberOfDirectors
866 Numbers of executive committee members Concept (Integer) For Period obsv:NumberOfExecutiveCommitteeMembers
867 Description of other significant transactions with related parties Concept (Text/String) For Period ifrs-full:DescriptionOfOtherTransactionsThatAreCollectivelySignificant
868 100920 - Disclosure - Related Parties Transactions - Summary of Total Remuneration Recorded for Members of the Board of Directors and Executive Committee (Detail) Network

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 http://www.obseva.com/20181231/taxonomy/role/DisclosureRelatedPartiesTransactionsSummaryOfTotalRemunerationRecordedForMembersOfBoardOfDirectorsAndExecutiveCommitteeDetail
869 Implied Table Table

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 implied:Table
870 Disclosure Of Transactions Between Related Parties [Abstract] Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
871 Short-term employee benefits (including base and variable cash remuneration) Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
872 Post-employment benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
873 Share-based payments Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
874 Total Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation

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