Segment Reporting Revenue and Property and Equipment by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Net revenue									$ 296,500	$ 253,388	$ 209,336
Depreciation and amortization expense									15,717	10,437	9,007
Net income (loss)	$ (13,262)	$ (88,520)	$ (546)	$ (2,169)	$ (2,925)	$ (1,325)	$ 27	$ (528)	(104,497)	(4,751)	(5,120)
Total assets	277,209				333,855				277,209	333,855
Property and equipments, net	35,732				24,061				35,732	24,061
Americas
Net revenue									266,034	227,914	185,241
Depreciation and amortization expense									10,619	6,842	5,776
Net income (loss)									(84,792)	2,557	940
Total assets	240,099				284,011				240,099	284,011
Property and equipments, net	27,210				19,480				27,210	19,480
Europe
Net revenue									30,466	25,474	24,095
Depreciation and amortization expense									5,098	3,595	3,231
Net income (loss)									(19,705)	(7,308)	$ (6,060)
Total assets	37,110				49,844				37,110	49,844
Property and equipments, net	$ 8,462				$ 4,581				$ 8,462	$ 4,581