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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2015-06-30","val":5925000,"accn":"0001437749-15-015884","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":5992000,"accn":"0001437749-15-020847","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16","frame":"CY2015Q3I"},{"end":"2015-12-31","val":4036000,"accn":"0001437749-16-028645","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2015Q4I"},{"end":"2016-03-31","val":4036000,"accn":"0001437749-16-031896","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-16","frame":"CY2016Q1I"},{"end":"2016-06-30","val":4175000,"accn":"0001437749-16-037368","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15","frame":"CY2016Q2I"},{"end":"2016-09-30","val":4175000,"accn":"0001437749-16-041978","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14","frame":"CY2016Q3I"},{"end":"2016-12-31","val":3621000,"accn":"0001437749-17-004577","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-15","frame":"CY2016Q4I"},{"end":"2017-03-31","val":3620000,"accn":"0001437749-17-009066","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2017Q1I"},{"end":"2017-06-30","val":3620000,"accn":"0001437749-17-014592","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14","frame":"CY2017Q2I"},{"end":"2017-09-30","val":3620000,"accn":"0001437749-17-019228","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14","frame":"CY2017Q3I"},{"end":"2017-12-31","val":3356000,"accn":"0001437749-18-004301","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-09","frame":"CY2017Q4I"},{"end":"2018-03-31","val":3357000,"accn":"0001437749-18-009833","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2016-12-31","val":13179000,"accn":"0001437749-17-004577","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-15","frame":"CY2016Q4I"},{"end":"2017-03-31","val":11902000,"accn":"0001437749-17-009066","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2017Q1I"},{"end":"2017-06-30","val":430000,"accn":"0001437749-17-014592","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14","frame":"CY2017Q2I"},{"end":"2017-09-30","val":146000,"accn":"0001437749-17-019228","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14","frame":"CY2017Q3I"},{"end":"2017-12-31","val":1028000,"accn":"0001437749-18-004301","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-09","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. 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from Interest Received","description":"Interest received on loans and other debt instruments during the current period.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":5000,"accn":"0001104659-12-021898","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-28","frame":"CY2009"},{"start":"2011-01-01","end":"2011-03-31","val":1000,"accn":"0001104659-12-035348","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1000,"accn":"0001104659-11-045466","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"start":"2011-01-01","end":"2011-06-30","val":1000,"accn":"0001104659-12-056323","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"start":"2011-01-01","end":"2011-09-30","val":1000,"accn":"0001104659-11-062234","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2011-01-01","end":"2011-09-30","val":1000,"accn":"0001104659-12-077493","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2011-01-01","end":"2011-12-31","val":1000,"accn":"0001104659-12-021898","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-28"},{"start":"2011-01-01","end":"2011-12-31","val":1000,"accn":"0001104659-13-024884","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-27"},{"start":"2011-01-01","end":"2011-12-31","val":1000,"accn":"0001104659-14-023921","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28","frame":"CY2011"},{"start":"2014-01-01","end":"2014-12-31","val":1000,"accn":"0001437749-15-006419","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2014-01-01","end":"2014-12-31","val":1000,"accn":"0001437749-16-028645","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2014"}]}},"ProceedsFromIssuanceOfDebt":{"label":"Proceeds from Issuance of Debt","description":"The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.","units":{"USD":[{"start":"2015-04-01","end":"2015-06-30","val":8100000,"accn":"0001437749-15-015884","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2"}]}},"ProceedsFromIssuanceOfLongTermDebt":{"label":"Proceeds from Issuance of Long-term Debt","description":"The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":600000,"accn":"0001104659-12-021898","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-28","frame":"CY2009"},{"start":"2015-01-01","end":"2015-03-31","val":5250000,"accn":"0001437749-15-010120","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14"},{"start":"2015-01-01","end":"2015-03-31","val":5250000,"accn":"0001437749-16-031896","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-16","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":5278000,"accn":"0001437749-15-015884","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2015-01-01","end":"2015-06-30","val":13378000,"accn":"0001437749-16-037368","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"},{"start":"2015-01-01","end":"2015-09-30","val":13378000,"accn":"0001437749-15-020847","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16"},{"start":"2015-01-01","end":"2015-09-30","val":13378000,"accn":"0001437749-16-041978","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14"},{"start":"2015-01-01","end":"2015-12-31","val":13378000,"accn":"0001437749-16-028645","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2015-01-01","end":"2015-12-31","val":13378000,"accn":"0001437749-17-004577","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-15","frame":"CY2015"},{"start":"2017-01-01","end":"2017-12-31","val":105000,"accn":"0001437749-18-004301","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-09","frame":"CY2017"}]}},"ProceedsFromLinesOfCredit":{"label":"Proceeds 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