| Standard label: | Equity Unit Purchase Agreements [Member] |
| Name: | us-gaap:EquityUnitPurchaseAgreementsMember |
| Documentation: | Contracts and securities that allow the holder to buy equity units from the entity. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:EquityUnitPurchaseAgreementsMember |
| Label | Role | Language |
| Equity Unit Purchase Agreements [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 260 10 50 1 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 260 |