Segment, Geographic Location and Customer Information - Net Sales by Geographic Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 23,239	$ 22,628	$ 58,829	$ 57,660
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	14,105	17,163	32,933	39,352
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	2,057	956	8,457	1,282
Italy
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,652	2,128	3,935	6,987
England
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	957	654	2,060	2,643
Other European Countries
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,823	834	4,600	1,850
Pacific And Far East
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,355	468	3,995	1,615
Other international
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 1,290	$ 425	$ 2,849	$ 3,931