Summary of Significant Accounting Policies - Equipment Under Capital Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016
Property, Plant and Equipment [Line Items]
Equipment	$ 33,205	$ 35,581
Less: accumulated depreciation and amortization	(18,963)	(18,577)
Property and equipment, net	14,242	17,004
Assets Held under Capital Leases
Property, Plant and Equipment [Line Items]
Equipment	581	408
Less: accumulated depreciation and amortization	(95)	(65)
Property and equipment, net	$ 486	$ 343