| Standard label: | Option Indexed to Issuer's Equity [Table] |
| Name: | us-gaap:OptionIndexedToIssuersEquityTable |
| Documentation: | Freestanding contracts issued by an Entity that are indexed to, and potentially settled in, an Entity's own stock by the different attributes of these freestanding contracts, including the strike price, number of shares, and settlement dates. |
| Object type: | cm:Table |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:OptionIndexedToIssuersEquityTable |
| Label | Role | Language |
| Option Indexed to Issuer's Equity [Table] | 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 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |
| 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 |