Segment, Geographic Location and Customer Information - Net Sales by Geographic Location (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 23,897	$ 17,671	$ 43,692	$ 35,590
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	14,538	10,278	26,355	18,829
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	2,135	2,013	4,539	6,400
Spain
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,121	471	1,977	1,382
Italy
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	744	1,613	1,700	2,282
England
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	539	475	1,017	1,104
Other European Countries
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	880	930	1,780	1,394
Pacific And Far East
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	2,731	837	4,102	2,639
Other international
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 1,209	$ 1,054	$ 2,222	$ 1,560