Stockholders' Equity (Deficit) (Tables)

12 Months Ended

Feb. 28, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Weighted-Average Input Assumptions Used to Estimate Fair Value of Employee Stock Purchase Plan Grants

The following weighted-average input assumptions were used to estimate the fair value of ESPP grants:

	Year Ended February 28/29,
	2017			2016			2015
Expected volatility	40		%	42		%	—		%
Expected term (in years)	0.50			0.50			0.00
Risk-free interest rate	0.41		%	0.27		%	—		%
Dividend yield	—			—			—
Estimated fair value of stock options granted during the year	$	5.25		$	5.37		$	—

Schedule of Shares Authorized and Available for Grant

The following table presents shares authorized and available for grant:

	Shares Available for Grant
Balance at February 29, 2016	6,360,677
Authorized	2,346,083
Granted	(2,232,166	)
Canceled/forfeited	1,113,224
Balance at February 28, 2017	7,587,818

Summary of Weighted-Average Input Assumptions Used to Estimate Fair Value of Employee Stock Option Grants

The following weighted-average input assumptions were used to estimate the fair value of employee stock option grants:

	Year Ended February 28/29,
	2017			2016			2015
Expected volatility	44		%	43		%	45		%
Expected term (in years)	6.21			6.25			6.25
Risk-free interest rate	1.52		%	1.80		%	1.87		%
Dividend yield	—			—			—
Estimated fair value of stock options granted during the year	$	7.95		$	13.80		$	13.98

Summary of Stock Option Activity

The following table summarizes stock option activity under our plans:

	Options Outstanding
	Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
					(in years)
Balance at February 29, 2016	4,208,201		$	20.42
Granted	279,746		$	20.04
Exercised	(622,848	)	$	12.52
Canceled/forfeited	(350,821	)	$	27.86
Balance at February 28, 2017	3,514,278		$	21.05
As of February 28, 2017:
Vested and exercisable	2,580,061		$	18.60	6.00	$	19,423,229
Vested and expected to vest	3,435,251		$	20.78	6.49	$	21,317,808

Summary of Restricted Stock Units Activity

The following table summarizes RSU activity under our plan:

	Unvested Restricted Stock Units
	Number of Shares		Weighted- Average Grant Date Fair Value
Unvested at February 29, 2016	2,450,819		$	25.38
Granted	1,952,420		$	19.46
Vested	(882,851	)	$	23.18
Canceled/forfeited	(427,911	)	$	22.83
Unvested at February 28, 2017	3,092,477		$	22.62
Expected to vest after February 28, 2017	2,719,152		$	22.71

Schedule of Total Stock-Based Compensation Expense

Total stock-based compensation expense has been classified as follows in the consolidated statements of operations (in thousands):

	Year Ended February 28//29,
	2017		2016		2015
Cost of revenue	$	1,367	$	1,062	$	389
Research and development	11,651		8,247		4,410
Sales and marketing	8,074		6,566		3,811
General and administrative	11,613		12,971		8,448
	$	32,705	$	28,846	$	17,058

Summary of Common Stock Repurchases

The following table summarizes our common stock repurchases (in thousands, except per share data):

	Year Ended February 28//29,
	2017		2016		2015
Total number of shares repurchased	498		1,503		—
Dollar amount of shares repurchased	$	7,596	$	19,216	$	—
Average price paid per share	$	15.25	$	12.79	$	—
Remaining amount authorized as of the end of period	$	23,188	$	30,784	$	—