- DefinitionMaturity date of investment, in YYYY-MM-DD format.
Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
 -Publisher FASB
 -Name Accounting Standards Codification
 -Topic 320
 -SubTopic 10
 -Section 50
 -Paragraph 5
 -Subparagraph (f)
 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563
Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
 -Publisher FASB
 -Name Accounting Standards Codification
 -Topic 320
 -SubTopic 10
 -Section 50
 -Paragraph 2
 -Subparagraph (d)
 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563
| Name: | us-gaap_InvestmentMaturityDate | 
| Namespace Prefix: | us-gaap_ | 
| Data Type: | xbrli:dateItemType | 
| Balance Type: | na | 
| Period Type: | instant |