Goodwill and Purchased Intangibles Assets - Schedule of Purchased Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying	$ 5,300	$ 5,300
Accumulated Amortization	(1,884)	(1,639)
Net Carrying Amount	3,416	3,661
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying	4,900	4,900
Accumulated Amortization	(1,539)	(1,339)
Net Carrying Amount	3,361	3,561
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying	100	100
Accumulated Amortization	(86)	(75)
Net Carrying Amount	14	25
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying	300	300
Accumulated Amortization	(259)	(225)
Net Carrying Amount	$ 41	$ 75