| Standard label: | Short-term Investments [Member] |
| Name: | us-gaap:ShortTermInvestmentsMember |
| Documentation: | Investments which are not otherwise included in another category or item that the entity has the intent to sell or dispose of within one year from the date of the balance sheet. |
| 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:ShortTermInvestmentsMember |
| Label | Role | Language |
| Short-term Investments [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 946 320 S99 7 (SX 210.12-15(Column A)) | http://www.xbrl.org/2003/role/exampleRef | 946 |