| Standard label: | Copyrights [Member] |
| Name: | us-gaap:CopyrightsMember |
| Documentation: | Legal rights held for a finite period specified by law, covering only the form or manner in which ideas or information have been manifested, and which prohibit reproduction of same without the right holder's consent, such as reproducing a copyrighted text, work of art, or software. |
| 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:CopyrightsMember |
| Label | Role | Language |
| Copyrights [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 805 20 55 30 | http://fasb.org/us-gaap/role/ref/legacyRef | 805 |
| FASB Accounting Standards Codification 805 20 55 40 | http://fasb.org/us-gaap/role/ref/legacyRef | 805 |
| FASB Accounting Standards Codification 805 20 55 42 | http://fasb.org/us-gaap/role/ref/legacyRef | 805 |