Segment, Geographic Location and Customer Information - Net Sales by Geographic Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 17,919	$ 19,568
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	8,551	12,393
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	4,387	326
Italy
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	669	2,653
England
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	629	324
Other European Countries
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,375	566
Pacific And Far East
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,802	591
Other International
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 506	$ 2,715