Goodwill and Purchased Intangibles Assets - Schedule of Purchased Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,300	$ 2,800
Accumulated Amortization	(1,381)	(500)
Net Carrying Amount	3,919	2,300
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,900	2,400
Accumulated Amortization	(1,139)	(400)
Net Carrying Amount	$ 3,761	2,000
Remaining Useful Life (In years)	2 years 9 months 29 days
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 100	100
Accumulated Amortization	(61)	(25)
Net Carrying Amount	$ 39	$ 75
Remaining Useful Life (In years)	9 months	1 year 6 months
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 300	$ 300
Accumulated Amortization	(181)	(75)
Net Carrying Amount	$ 119	$ 225
Remaining Useful Life (In years)	9 months	1 year 6 months