Summary of Significant Accounting Policies - Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning of period	$ 1,043	$ 466	$ 1,015	$ 263
Provision to product cost of revenue	(1)	685	88	718
Charges	(104)	(35)	(165)	135
End of period	$ 938	$ 1,116	$ 938	$ 1,116