Segment, Geographic Location and Customer Information - Net Sales by Geographic Location (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 19,795	$ 17,919
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	12,334	8,551
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	2,404	4,387
Italy
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	956	669
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	478	629
Other European Countries
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,777	1,375
Pacific and Far East
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	833	1,802
Other International
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 1,013	$ 506