| Standard label: | Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |
| Name: | us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |
| Documentation: | Net number of share options (or share units) granted during the period. |
| Object type: | cm:Concept |
| Data type: | Shares (xbrli:sharesItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |
| Label | Role | Language |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | http://www.xbrl.org/2003/role/label | en-US |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 718 10 50 2 (c)(1)(iv)(1) | http://fasb.org/us-gaap/role/ref/legacyRef | 718 |
| Part Of Roll Up: |
| us-gaap:StockIssuedDuringPeriodSharesPeriodIncreaseDecrease |