Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 33,562	$ 28,502
Accumulated depreciation and amortization	(16,050)	(12,502)
Property and equipment, net	17,512	16,000
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,671	7,955
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,885	12,013
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,819	6,317
Project expenditures not yet in use [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,187	$ 2,217