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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. 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":"2018-09-30","val":164300000,"accn":"0001694665-18-000010","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":147900000,"accn":"0001694665-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-15","frame":"CY2018Q4I"},{"end":"2019-03-31","val":129400000,"accn":"0001694665-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-03","frame":"CY2019Q1I"},{"end":"2019-06-30","val":113500000,"accn":"0001694665-19-000069","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06","frame":"CY2019Q2I"},{"end":"2019-09-30","val":97100000,"accn":"0001694665-19-000078","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-05","frame":"CY2019Q3I"},{"end":"2019-12-31","val":77800000,"accn":"0001694665-20-000017","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-14","frame":"CY2019Q4I"},{"end":"2020-03-31","val":58100000,"accn":"0001694665-20-000039","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-11","frame":"CY2020Q1I"},{"end":"2020-06-30","val":90200000,"accn":"0001694665-20-000079","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-07-31","frame":"CY2020Q2I"},{"end":"2020-09-30","val":81600000,"accn":"0001694665-20-000090","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-10-30","frame":"CY2020Q3I"},{"end":"2021-03-31","val":124600000,"accn":"0001694665-21-000066","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-04-29","frame":"CY2021Q1I"},{"end":"2021-06-30","val":123300000,"accn":"0001694665-21-000111","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-07-29","frame":"CY2021Q2I"}]}},"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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The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. 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":{"USD":[{"end":"2017-12-31","val":89975000,"accn":"0001193125-18-180379","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-31"},{"end":"2017-12-31","val":89975000,"accn":"0001193125-18-236655","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02"},{"end":"2017-12-31","val":89975000,"accn":"0001694665-18-000010","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":89975000,"accn":"0001694665-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-15","frame":"CY2017Q4I"},{"end":"2018-03-31","val":174612000,"accn":"0001193125-18-180379","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-31","frame":"CY2018Q1I"},{"end":"2018-06-30","val":0,"accn":"0001193125-18-236655","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02","frame":"CY2018Q2I"},{"end":"2018-09-30","val":0,"accn":"0001694665-18-000010","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":0,"accn":"0001694665-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-15","frame":"CY2018Q4I"}]}},"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. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.","units":{"USD/shares":[{"end":"2017-12-31","val":0.001,"accn":"0001193125-18-180379","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-31"},{"end":"2017-12-31","val":0.001,"accn":"0001193125-18-236655","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02"},{"end":"2017-12-31","val":0.001,"accn":"0001694665-18-000010","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":0.001,"accn":"0001694665-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-15","frame":"CY2017Q4I"},{"end":"2018-03-31","val":0.001,"accn":"0001193125-18-180379","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-31","frame":"CY2018Q1I"},{"end":"2018-06-30","val":0.001,"accn":"0001193125-18-236655","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02","frame":"CY2018Q2I"},{"end":"2018-09-30","val":0.001,"accn":"0001694665-18-000010","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":0.001,"accn":"0001694665-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-15","frame":"CY2018Q4I"}]}},"TemporaryEquitySharesAuthorized":{"label":"Temporary Equity, Shares Authorized","description":"The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. 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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":"2017-12-31","val":66311563,"accn":"0001193125-18-180379","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-31"},{"end":"2017-12-31","val":66311563,"accn":"0001193125-18-236655","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02"},{"end":"2017-12-31","val":66311563,"accn":"0001694665-18-000010","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":66311563,"accn":"0001694665-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-15","frame":"CY2017Q4I"},{"end":"2018-03-31","val":91543762,"accn":"0001193125-18-180379","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-31","frame":"CY2018Q1I"},{"end":"2018-06-30","val":0,"accn":"0001193125-18-236655","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02","frame":"CY2018Q2I"},{"end":"2018-09-30","val":0,"accn":"0001694665-18-000010","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":0,"accn":"0001694665-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-15","frame":"CY2018Q4I"}]}},"TemporaryEquitySharesIssued":{"label":"Temporary Equity, Shares Issued","description":"The number of securities classified as temporary equity that have been sold (or granted) to 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. 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Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. 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 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