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An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.","units":{"USD":[{"end":"2016-12-31","val":3138000,"accn":"0001403853-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-16"},{"end":"2016-12-31","val":3138000,"accn":"0001403853-19-000010","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-12","frame":"CY2016Q4I"},{"end":"2017-12-31","val":6435000,"accn":"0001403853-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-16"},{"end":"2017-12-31","val":6435000,"accn":"0001403853-19-000010","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-12"},{"end":"2017-12-31","val":6435000,"accn":"0001403853-20-000016","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-10","frame":"CY2017Q4I"},{"end":"2018-12-31","val":7128000,"accn":"0001403853-19-000010","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-12"},{"end":"2018-12-31","val":7128000,"accn":"0001403853-20-000016","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-10"},{"end":"2018-12-31","val":7128000,"accn":"0001403853-21-000014","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-16","frame":"CY2018Q4I"},{"end":"2019-12-31","val":7486000,"accn":"0001403853-20-000016","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-10"},{"end":"2019-12-31","val":7486000,"accn":"0001403853-21-000014","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-16","frame":"CY2019Q4I"},{"end":"2020-12-31","val":8017000,"accn":"0001403853-21-000014","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-16","frame":"CY2020Q4I"}]}},"AssetRetirementObligationAccretionExpense":{"label":"Asset Retirement Obligation, Accretion Expense","description":"Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. 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and Cash Equivalents, at Carrying Value, Including Discontinued Operations","description":"For the entity and the disposal group, cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also 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. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash 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Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Includes effect from exchange rate 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0-Q","filed":"2016-08-08"},{"start":"2015-01-01","end":"2015-09-30","val":-181000,"accn":"0001403853-15-000042","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"start":"2015-01-01","end":"2015-09-30","val":-181000,"accn":"0001403853-16-000079","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07"},{"start":"2015-01-01","end":"2015-12-31","val":-181000,"accn":"0001403853-16-000049","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-14"},{"start":"2015-01-01","end":"2015-12-31","val":-181000,"accn":"0001403853-17-000009","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-14","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":0,"accn":"0001403853-16-000058","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-09","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":0,"accn":"0001403853-16-000067","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-08"},{"start":"2016-01-01","end":"2016-09-30","val":0,"accn":"0001403853-16-000079","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0001403853-17-000009","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-14","frame":"CY2016"},{"start":"2017-08-01","end":"2017-12-31","val":0,"accn":"0001403853-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-16"}]}},"CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations":{"label":"Cash 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A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. 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Includes, but is not limited to, measurement period adjustment and less amount paid soon after acquisition date.","units":{"USD":[{"start":"2017-08-01","end":"2017-08-31","val":500000,"accn":"0001403853-17-000040","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-08"},{"start":"2017-08-01","end":"2017-08-31","val":500000,"accn":"0001403853-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-16"},{"start":"2017-08-01","end":"2017-08-31","val":500000,"accn":"0001403853-19-000010","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-12"},{"start":"2017-08-01","end":"2017-08-31","val":500000,"accn":"0001403853-20-000016","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-10","frame":"CY2017Q3I"}]}},"PaymentsForLegalSettlements":{"label":"Payments for Legal Settlements","description":"The amount of cash paid for the settlement of litigation or for other legal issues during the 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for Repurchase of Common Stock","description":"The cash outflow to reacquire common stock during the 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Excludes payments associated with a discontinued operation or an asset retirement 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