Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016
Payables and Accruals [Abstract]
Accounts payable	$ 1,800	$ 3,207
Accrued inventories in-transit	709	313
Accrued other miscellaneous expenses	2,032	2,240
Accrued restructuring	751	0
Accrued compensation	5,333	5,042
Income taxes payable	1,369	1,344
Accrued warranty	2,026	2,344	$ 2,774	$ 3,601
Total	$ 14,020	$ 14,490