Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Payables and Accruals [Abstract]
Accrued employee compensation and related expenses	$ 8,509	$ 18,109
Accrued interest	835	1,172
Customer prepayment	588	783
Warranty reserve	500	365
Professional fees	2,470	2,326
Sales tax payable	4,722	2,185
Other	3,763	2,908
Total accrued current liabilities	$ 21,387	$ 27,848