Summary of Significant Accounting Policies - Equipment Under Capital Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Equipment	$ 40,974	$ 40,974		$ 41,160
Accumulated depreciation and amortization	(21,788)	(21,788)		(19,937)
Net property and equipment	19,186	19,186		21,223
Depreciation		2,320	$ 2,154
Assets Held under Capital Leases
Property, Plant and Equipment [Line Items]
Equipment	389	389		0
Accumulated depreciation and amortization	(46)	(46)		0
Net property and equipment	343	343		$ 0
Depreciation	$ 20	$ 46