| Standard label: | Royalty Agreements [Member] |
| Name: | us-gaap:RoyaltyAgreementsMember |
| Documentation: | Contractual arrangement, generally for a defined period of time, entitling the entity to use the rights and property of another party. Examples include, but not limited to, licensing the use of copyrighted materials and leasing the extraction of natural resources. |
| 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:RoyaltyAgreementsMember |
| Label | Role | Language |
| Royalty Agreements [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 805 20 55 31 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 805 |