Stock Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2013	Aug. 31, 2013	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Class of Stock [Line Items]
Total share-based compensation expense			$ 23,268	$ 11,666	$ 6,220
Research and Development [Member]
Class of Stock [Line Items]
Total share-based compensation expense			6,659	2,055	1,425
Sales and Marketing [Member]
Class of Stock [Line Items]
Total share-based compensation expense			9,258	5,108	1,373
General and Administrative [Member]
Class of Stock [Line Items]
Total share-based compensation expense			$ 6,113	$ 3,912	3,263
Investors [Member]
Class of Stock [Line Items]
Total share-based compensation expense					2,400
Investors [Member] | Research and Development [Member]
Class of Stock [Line Items]
Total share-based compensation expense					800
Investors [Member] | Sales and Marketing [Member]
Class of Stock [Line Items]
Total share-based compensation expense					200
Investors [Member] | General and Administrative [Member]
Class of Stock [Line Items]
Total share-based compensation expense					$ 1,400
Common Stock [Member] | Investors [Member]
Class of Stock [Line Items]
Number of outstanding stock under tender offer	347,000	347,000
Stock purchase price under tender offer	$ 17.4089	$ 17.4089