Segment, Geographic Location and Customer Information - Net Sales by Geographic Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 17,671	$ 15,464	$ 35,590	$ 35,032
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	10,278	9,796	18,829	22,189
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	2,013		6,400	326
Italy
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,613	2,206	2,282	4,859
England
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	475	1,665	1,104	1,989
Other European Countries
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,401	450	2,776	1,016
Pacific And Far East
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	837	556	2,639	1,147
Other international
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 1,054	$ 791	$ 1,560	$ 3,506