Geographic Information - Schedule of Revenue From Customer By Geographic Area (Detail) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue		$ 18,522	$ 18,408	$ 19,755
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue		8,879	8,299	9,705
United Kingdom [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue		1,437	938	907
France [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue		3,376	3,419	3,352
Japan [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue		2,836	2,685	2,162
Other foreign countries [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	[1]	$ 1,994	$ 3,067	$ 3,629

[1] No individual country represented more than 10% of the respective totals.