| Standard label: | Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period |
| Name: | us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod |
| Documentation: | For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. |
| 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:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod |
| Label | Role | Language |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period | http://www.xbrl.org/2003/role/label | en-US |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 718 10 50 2 (c)(1)(iv)(3)-(4) | http://fasb.org/us-gaap/role/ref/legacyRef | 718 |
| Part Of Roll Up: |
| us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecrease |