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Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.","units":{"USD":[{"end":"2014-03-31","val":23962000,"accn":"0001193125-14-201008","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2014Q1I"},{"end":"2014-06-30","val":57879000,"accn":"0001193125-14-308547","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13","frame":"CY2014Q2I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. 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Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2016-12-31","val":12613000,"accn":"0001493152-18-007178","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15"},{"end":"2016-12-31","val":12613000,"accn":"0001493152-18-011825","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2016-12-31","val":12613000,"accn":"0001493152-18-016194","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14","frame":"CY2016Q4I"},{"end":"2017-03-31","val":4786000,"accn":"0001493152-18-007178","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2017Q1I"},{"end":"2017-06-30","val":13246000,"accn":"0001493152-18-011825","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2I"},{"end":"2017-09-30","val":6230000,"accn":"0001493152-18-016194","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14","frame":"CY2017Q3I"},{"end":"2017-12-31","val":2833000,"accn":"0001493152-18-007178","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15"},{"end":"2017-12-31","val":2833000,"accn":"0001493152-18-011825","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":2833000,"accn":"0001493152-18-016194","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14"},{"end":"2017-12-31","val":2833000,"accn":"0001493152-19-004161","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-29","frame":"CY2017Q4I"},{"end":"2018-03-31","val":16804000,"accn":"0001493152-18-007178","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1I"},{"end":"2018-06-30","val":24856000,"accn":"0001493152-18-011825","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":22130000,"accn":"0001493152-18-016194","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14","frame":"CY2018Q3I"},{"end":"2018-12-31","val":19781000,"accn":"0001493152-19-004161","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-29","frame":"CY2018Q4I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. 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