Goodwill and Purchased Intangibles Assets - Schedule of Purchased Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying	$ 5,300	$ 5,300
Accumulated Amortization	(2,139)	(1,639)
Net Carrying Amount	3,161	3,661
Developed Technology Rights
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying	4,900	4,900
Accumulated Amortization	(1,739)	(1,339)
Net Carrying Amount	3,161	3,561
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying	100	100
Accumulated Amortization	(100)	(75)
Net Carrying Amount	0	25
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying	300	300
Accumulated Amortization	(300)	(225)
Net Carrying Amount	$ 0	$ 75