Common Stock and Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2016

Equity [Abstract]

Schedule of Shares of Common Stock Reserved for Future Issuance

The Company had reserved shares of common stock for future issuance as follows (in thousands):

	As of March 31,
	2016		2015
Common stock options outstanding		7,050		9,422
RSUs outstanding		1,549		723
Common stock reserved for issuance in connection with acquisition		90		129
Available for future stock option and RSU grants		6,561		5,149
Available for future employee stock purchase plan awards		1,360		1,000
		16,610		16,423

Schedule of Stock Option and RSU Award Activities

The following table summarizes the Company’s stock option and RSU award activities for the fiscal year ended March 31, 2016 (in thousands, except per share information):

	Options Outstanding									RSUs Outstanding
	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value		Number of Shares			Weighted- Average Grant Date Fair Value		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding—April 1, 2015		9,422		$	10.08		7.9	$	231,964		723		$	23.87		3.5	$	25,098
Stock options granted		685			32.17
RSUs granted											1,155			32.45
Stock options exercised		(2,324	)		5.39				65,572
RSUs vested											(166	)		25.17
Stock options canceled/forfeited		(733	)		15.58
RSUs canceled/forfeited											(163	)		27.71
Outstanding—March 31, 2016		7,050		$	13.20		6.5	$	95,326		1,549		$	29.73		3.1	$	40,387
Options vested and expected to vest— March 31, 2016		7,011		$	13.12		6.5	$	95,226
Options vested and exercisable— March 31, 2016		3,840		$	7.82		5.1	$	70,300
RSUs expected to vest—March 31, 2016											1,459		$	29.57		3.1	$	43,139

Schedule of Assumptions Used to Estimate Fair Value of Stock Options Granted and ESPP Shares to be Issued

The assumptions used to estimate the fair value of stock options granted and ESPP shares to be issued during the fiscal years ended March 31, 2016, 2015, and 2014 were as follows:

Stock Options:
	Year Ended March 31,
	2016	2015		2014
Expected term (years)	6		5 - 6		5 - 6
Expected volatility	45 - 47%		45 - 51%		47 - 52%
Risk-free interest rate	1.39 - 1.93%		1.40 - 2.01%		0.74 - 1.87%
Dividend yield	—		—		—
ESPP:
	Year Ended March 31,
	2016	2015		2014
Expected term (years)	0.5		—		—
Expected volatility	35 - 54%		—		—
Risk-free interest rate	0.25 - 0.42%		—		—
Dividend yield	—		—		—

Schedule of Cost of Revenue, Research and Development, Sales and Marketing and General and Administrative Expenses

Cost of revenue, research and development, sales and marketing, and general and administrative expenses were as follows (in thousands):

	Year Ended March 31,
	2016		2015		2014
Cost of revenue	$	1,238	$	591	$	159
Research and development		6,659		2,055		1,425
Sales and marketing		9,258		5,108		1,373
General and administrative		6,113		3,912		3,263
Total stock-based compensation expense	$	23,268	$	11,666	$	6,220