| Standard label: | Option Indexed to Issuer's Equity, Redeemable Stock, Redemption Requirements, Amount |
| Name: | us-gaap:OptionIndexedToIssuersEquityRedeemableStockRedemptionRequirementsAmount1 |
| Documentation: | Amount of redeemable stock for issue of capital stock that are redeemable at fixed or determinable prices on fixed or determinable dates in each of the five years following the date of the latest statement of financial position presented. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:OptionIndexedToIssuersEquityRedeemableStockRedemptionRequirementsAmount1 |
| Label | Role | Language |
| Option Indexed to Issuer's Equity, Redeemable Stock, Redemption Requirements, Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 505 10 50 11 | http://fasb.org/us-gaap/role/ref/legacyRef | 505 |
| FASB Accounting Standards Codification 815 40 50 5 (e) | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |