| Standard label: | Rights [Member] |
| Name: | us-gaap:RightsMember |
| Documentation: | A security giving shareholders entitlement to acquire new shares issued by the entity at an established price in proportion to the number of shares already owned. Generally, rights expire within in a short time after issuance. |
| 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:RightsMember |
| Label | Role | Language |
| Rights [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |