Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 3,207	$ 5,837
Accrued inventories in-transit	313	1,908
Accrued other miscellaneous expenses	2,240	3,003
Accrued compensation	5,042	7,526
Income taxes payable	1,344	1,281
Accrued warranty	2,344	3,601	$ 3,934
Total	$ 14,490	$ 23,156