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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":"2013-03-31","val":13136000,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2013Q1I"},{"end":"2013-06-30","val":9826000,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2013Q2I"},{"end":"2013-09-30","val":8212000,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2013Q3I"},{"end":"2013-12-31","val":10738000,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2013Q4I"},{"end":"2014-03-31","val":84937000,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q1I"},{"end":"2014-06-30","val":74496000,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q2I"},{"end":"2014-09-30","val":72030000,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q3I"},{"end":"2014-12-31","val":63679000,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":58700000,"accn":"0001301501-16-000046","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-03-31","val":49500000,"accn":"0001301501-16-000061","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05","frame":"CY2016Q1I"},{"end":"2016-06-30","val":70000000,"accn":"0001301501-16-000080","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-08","frame":"CY2016Q2I"},{"end":"2016-09-30","val":61100000,"accn":"0001301501-16-000088","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07","frame":"CY2016Q3I"},{"end":"2016-12-31","val":145900000,"accn":"0001564590-17-004283","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14","frame":"CY2016Q4I"},{"end":"2017-03-31","val":132000000,"accn":"0001564590-17-009402","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08","frame":"CY2017Q1I"},{"end":"2017-06-30","val":230300000,"accn":"0001564590-17-016508","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08","frame":"CY2017Q2I"},{"end":"2017-09-30","val":199400000,"accn":"0001564590-17-022736","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-08","frame":"CY2017Q3I"},{"end":"2017-12-31","val":164800000,"accn":"0001564590-18-003544","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2017Q4I"},{"end":"2018-03-31","val":144000000,"accn":"0001564590-18-011139","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-07","frame":"CY2018Q1I"},{"end":"2018-06-30","val":100500000,"accn":"0001564590-18-019496","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-06","frame":"CY2018Q2I"},{"end":"2018-09-30","val":58200000,"accn":"0001564590-18-028650","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"},{"end":"2018-12-31","val":31000000,"accn":"0001564590-19-010412","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018Q4I"}]}},"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. 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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":119341000,"accn":"0001564590-18-011139","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-07"},{"end":"2016-12-31","val":119341000,"accn":"0001564590-18-019496","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-06"},{"end":"2016-12-31","val":119341000,"accn":"0001564590-18-028650","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"end":"2016-12-31","val":119341000,"accn":"0001564590-19-010412","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2016Q4I"},{"end":"2017-03-31","val":38016000,"accn":"0001564590-18-011139","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-07","frame":"CY2017Q1I"},{"end":"2017-06-30","val":156565000,"accn":"0001564590-18-019496","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-06","frame":"CY2017Q2I"},{"end":"2017-09-30","val":145892000,"accn":"0001564590-18-028650","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3I"},{"end":"2017-12-31","val":154965000,"accn":"0001564590-18-011139","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-07"},{"end":"2017-12-31","val":154965000,"accn":"0001564590-18-019496","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-06"},{"end":"2017-12-31","val":154965000,"accn":"0001564590-18-028650","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"end":"2017-12-31","val":154965000,"accn":"0001564590-19-010412","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2017Q4I"},{"end":"2018-03-31","val":103216000,"accn":"0001564590-18-011139","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-07","frame":"CY2018Q1I"},{"end":"2018-06-30","val":70254000,"accn":"0001564590-18-019496","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-06","frame":"CY2018Q2I"},{"end":"2018-09-30","val":62230000,"accn":"0001564590-18-028650","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"},{"end":"2018-12-31","val":56486000,"accn":"0001564590-19-010412","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018Q4I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect","description":"Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. 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":[{"start":"2017-01-01","end":"2017-06-30","val":37224000,"accn":"0001564590-18-019496","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-06"},{"start":"2017-01-01","end":"2017-09-30","val":26551000,"accn":"0001564590-18-028650","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":35624000,"accn":"0001564590-19-010412","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2017"},{"start":"2018-01-01","end":"2018-06-30","val":-84711000,"accn":"0001564590-18-019496","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-06"},{"start":"2018-01-01","end":"2018-09-30","val":-92735000,"accn":"0001564590-18-028650","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-01-01","end":"2018-12-31","val":-98479000,"accn":"0001564590-19-010412","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018"}]}},"ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1":{"label":"Class of Warrant or Right, Exercise Price of Warrants or Rights","description":"Exercise price per share or per unit of warrants or rights outstanding.","units":{"USD/shares":[{"end":"2014-01-31","val":1.54,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16"},{"end":"2014-01-31","val":1.54,"accn":"0001301501-16-000046","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2013Q4I"},{"end":"2015-03-31","val":11.99,"accn":"0001301501-15-000020","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2015Q1I"},{"end":"2015-06-30","val":11.99,"accn":"0001301501-15-000027","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-10","frame":"CY2015Q2I"},{"end":"2015-09-30","val":11.99,"accn":"0001301501-15-000036","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2016-03-31","val":11.99,"accn":"0001301501-16-000061","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05","frame":"CY2016Q1I"},{"end":"2016-06-30","val":3.78,"accn":"0001301501-16-000080","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-08"},{"end":"2016-06-30","val":3.78,"accn":"0001564590-17-016508","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08","frame":"CY2016Q2I"},{"end":"2016-09-30","val":3.78,"accn":"0001301501-16-000088","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07"},{"end":"2016-09-30","val":3.78,"accn":"0001564590-17-022736","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-08","frame":"CY2016Q3I"},{"end":"2016-12-31","val":3.85,"accn":"0001564590-17-004283","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14","frame":"CY2016Q4I"},{"end":"2017-03-31","val":3.78,"accn":"0001564590-17-009402","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08","frame":"CY2017Q1I"},{"end":"2017-06-30","val":3.78,"accn":"0001564590-17-016508","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08","frame":"CY2017Q2I"},{"end":"2017-09-30","val":3.78,"accn":"0001564590-17-022736","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-08","frame":"CY2017Q3I"},{"end":"2017-12-31","val":3.78,"accn":"0001564590-18-003544","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27"},{"end":"2017-12-31","val":3.78,"accn":"0001564590-18-011139","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-07"},{"end":"2017-12-31","val":3.78,"accn":"0001564590-18-019496","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-06"},{"end":"2017-12-31","val":3.78,"accn":"0001564590-18-028650","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":3.78,"accn":"0001564590-18-011139","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-07","frame":"CY2018Q1I"},{"end":"2018-06-30","val":3.78,"accn":"0001564590-18-019496","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-06","frame":"CY2018Q2I"},{"end":"2018-09-30","val":3.78,"accn":"0001564590-18-028650","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights":{"label":"Class of Warrant or Right, Number of Securities Called by Warrants or Rights","description":"Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.","units":{"shares":[{"end":"2015-03-31","val":30024,"accn":"0001301501-15-000020","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2015Q1I"},{"end":"2015-06-30","val":30024,"accn":"0001301501-15-000027","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-10","frame":"CY2015Q2I"}]}},"ClassOfWarrantOrRightOutstanding":{"label":"Class of Warrant or Right, Outstanding","description":"Number of warrants or rights 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90-19-010412","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018"}]}},"OperatingLeasesRentExpenseSubleaseRentals1":{"label":"Operating 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Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2013-12-31","val":132278000,"accn":"0001193125-14-193412","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12"},{"end":"2013-12-31","val":132278000,"accn":"0001193125-14-304922","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-11"},{"end":"2013-12-31","val":132278000,"accn":"0001193125-14-404168","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10"},{"end":"2013-12-31","val":132278000,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q4I"}]}},"TemporaryEquityParOrStatedValuePerShare":{"label":"Temporary Equity, Par or Stated Value Per Share","description":"Per share amount of par value or stated value of stock classified as temporary equity. 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If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2013-12-31","val":9796342,"accn":"0001193125-14-193412","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12"},{"end":"2013-12-31","val":9796342,"accn":"0001193125-14-304922","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-11"},{"end":"2013-12-31","val":9796342,"accn":"0001193125-14-404168","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10"},{"end":"2013-12-31","val":9796342,"accn":"0001628280-15-001797","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2013Q4I"},{"end":"2014-03-31","val":0,"accn":"0001193125-14-193412","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12","frame":"CY2014Q1I"},{"end":"2014-06-30","val":0,"accn":"0001193125-14-304922","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-11","frame":"CY2014Q2I"},{"end":"2014-09-30","val":0,"accn":"0001193125-14-404168","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10","frame":"CY2014Q3I"}]}},"TemporaryEquitySharesOutstanding":{"label":"Temporary Equity, Shares Outstanding","description":"The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. 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If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2013-12-31","val":9796342,"accn":"0001193125-14-193412","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12"},{"end":"2013-12-31","val":9796342,"accn":"0001193125-14-304922","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-11"},{"end":"2013-12-31","val":9796342,"accn":"0001193125-14-404168","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10","frame":"CY2013Q4I"},{"end":"2014-03-31","val":0,"accn":"0001193125-14-193412","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12","frame":"CY2014Q1I"},{"end":"2014-06-30","val":0,"accn":"0001193125-14-304922","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-11","frame":"CY2014Q2I"},{"end":"2014-09-30","val":0,"accn":"0001193125-14-404168","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10","frame":"CY2014Q3I"}]}},"UnrecognizedTaxBenefits":{"label":"Unrecognized Tax 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