| Standard label: | Option Indexed to Issuer's Equity, Type [Axis] |
| Name: | us-gaap:OptionIndexedToIssuersEquityTypeAxis |
| Documentation: | Information by type of freestanding contracts issued by an entity that are indexed to, and potentially settled in, an entity's own stock. |
| Object type: | cm:Axis |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:OptionIndexedToIssuersEquityTypeAxis |
| Label | Role | Language |
| Option Indexed to Issuer's Equity, Type [Axis] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 480 10 55 63 | http://fasb.org/us-gaap/role/ref/legacyRef | 480 |
| FASB Accounting Standards Codification 815 40 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |
| FASB Accounting Standards Codification 815 40 50 4 | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |
| FASB Accounting Standards Codification 815 40 50 5 | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |