| Standard label: | Registration Payment Arrangement, Gains and Losses |
| Name: | us-gaap:RegistrationPaymentArrangementGainsAndLosses |
| Documentation: | The decrease (gain) or increase (loss) in the carrying amount of the registration payment obligation that was recognized in earnings during the period. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:RegistrationPaymentArrangementGainsAndLosses |
| Label | Role | Language |
| Registration Payment Arrangement, Gains and Losses | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 825 20 50 1 (f) | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |