| Standard label: | Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |
| Name: | us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount |
| Documentation: | Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount |
| Label | Role | Language |
| Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 740 10 45 20 | http://fasb.org/us-gaap/role/ref/legacyRef | 740 |
| Part Of Roll Up: |
| us-gaap:DeferredIncomeTaxExpenseBenefit |