Segment Reporting Revenue and Property and Equipment by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Net revenue	$ 85,682	$ 72,483	$ 168,907	$ 141,581
Depreciation and amortization expense	5,659	3,631	10,837	7,358
Net income (loss)	(21,482)	(546)	(36,837)	(2,715)
Intersegment revenues eliminated in consolidation	6,500	4,400	13,100	6,900
Total assets	309,632		309,632		$ 277,209
Property and equipments, net	42,395		42,395		35,732
Americas
Net revenue	77,100	65,121	151,965	127,526
Depreciation and amortization expense	4,665	2,336	8,972	4,869
Net income (loss)	(21,237)	970	(35,586)	1,379
Total assets	265,373		265,373		240,099
Property and equipments, net	34,958		34,958		27,270
Europe
Net revenue	8,582	7,362	16,942	14,055
Depreciation and amortization expense	994	1,295	1,865	2,489
Net income (loss)	(245)	$ (1,516)	(1,251)	$ (4,094)
Total assets	44,259		44,259		37,110
Property and equipments, net	$ 7,437		$ 7,437		$ 8,462