Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member] Series F Convertible Preferred Stock [Member]
Stockholders Equity, Beginning Balance at Mar. 31, 2013	$ (31,239)	$ 16	$ 10,234	$ (263)		$ (41,226)
Temporary Equity, Beginning Balance at Mar. 31, 2013							$ 95,917
Stockholders Equity, Beginning Balance, Shares at Mar. 31, 2013		15,756		260
Temporary Equity, Beginning Balance, Shares at Mar. 31, 2013							21,357
Temporary Equity, Ending Balance at Mar. 31, 2014							$ 95,917
Temporary Equity, Ending Balance, Shares at Mar. 31, 2014							21,357
Issuance of common stock upon exercise of stock options	294		294
Issuance of common stock upon exercise of stock options, Shares		207
Issuance of restricted stock awards subject to vesting	0	$ 0	0	$ 0	$ 0	0
Issuance of restricted stock awards subject to vesting, Shares		100
Stock-based compensation expense	6,505		6,505
Net loss	(40,225)					(40,225)
Stockholders Equity, Ending Balance at Mar. 31, 2014	(64,665)	$ 16	17,033	$ (263)		$ (81,451)
Stockholders Equity, Ending Balance, Shares at Mar. 31, 2014		16,063		260
Issuance of convertible preferred stock - net of issuance cost								$ 97,243
Issuance of convertible preferred stock - net of issuance cost, Shares								3,456
Conversion of convertible preferred stock to common stock upon initial public offering	193,160	$ 25	193,135				$ (193,160)
Conversion of convertible preferred stock to common stock upon initial public offering, Shares		24,886					(24,813)
Reclassification of preferred stock warrant liabilities into additional paid-in capital	$ 912		$ 912
Reclassification of preferred stock warrant liabilities into additional paid-in capital, Shares	0	0	0	0	0	0
Issuance of common stock upon exercise of warrants	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Issuance of common stock upon exercise of warrants, Shares		40
Issuance of common stock upon initial public offering-net of offering costs	119,924	$ 6	119,918
Issuance of common stock upon initial public offering - net of offering costs, Shares		5,750
Issuance of common stock related to acquisition of business	1,627		1,627
Issuance of common stock related to acquisition of business, Shares		108
Issuance of common stock for acquisition of Few Ducks, S.L. - Escrow Shares	188		188
Issuance of common stock upon exercise of stock options	1,209		1,209
Issuance of common stock upon exercise of stock options, Shares		490
Issuance of restricted stock awards subject to vesting	0	$ 0	0	0	0	0
Issuance of restricted stock awards subject to vesting, Shares		40
Stock-based compensation expense	12,649		12,649
Other comprehensive income, net	15				15
Net loss	(50,149)					(50,149)
Stockholders Equity, Ending Balance at Mar. 31, 2015	214,870	$ 47	346,671	$ (263)	15	(131,600)
Stockholders Equity, Ending Balance, Shares at Mar. 31, 2015		47,377		260
Issuance of common stock related to acquisition of business	6,777		6,777
Issuance of common stock related to acquisition of business, Shares		263
Issuance of common stock upon exercise of stock options	$ 12,521	$ 3	12,518
Issuance of common stock upon exercise of stock options, Shares	2,324	2,324
Issuance of restricted stock awards subject to vesting	$ 0	$ 0	0	$ 0	0	0
Issuance of restricted stock awards subject to vesting, Shares		166
Issuance of common stock related to employee stock purchase plan	2,243		2,243
Issuance of common stock related to employee stock purchase plan, Shares		111
Stock-based compensation expense	24,302		24,302
Other comprehensive income, net	7				7
Net loss	(67,487)					(67,487)
Stockholders Equity, Ending Balance at Mar. 31, 2016	$ 193,233	$ 50	$ 392,511	$ (263)	$ 22	$ (199,087)
Stockholders Equity, Ending Balance, Shares at Mar. 31, 2016		50,241		260