Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 7,650	$ 5,837
Accrued inventories in-transit	1,501	1,908
Accrued other miscellaneous expenses	3,769	3,003
Accrued compensation	7,598	7,526
Income taxes payable	1,402	1,281
Accrued warranty	2,774	3,601	$ 3,344	$ 3,934
Total	$ 24,694	$ 23,156