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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 15,464	$ 23,421	$ 35,032	$ 37,834
Reportable Geographical Components | United States
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	9,796	14,246	22,189	23,062
Reportable Geographical Components | England
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	1,665	1,910	1,989	2,568
Reportable Geographical Components | Italy
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	2,206	1,778	4,859	3,628
Reportable Geographical Components | Other European Countries
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	450	1,233	1,342	1,920
Reportable Geographical Components | Pacific And Far East
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	556	1,104	1,147	1,558
Reportable Geographical Components | Other International
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales by geographic location	$ 791	$ 3,150	$ 3,506	$ 5,098