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Stockholders' Deficit (Tables)
 12 Months Ended
Feb. 29, 2016
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 29, 2016
Expected volatility
42
%
Expected term (in years)
0.50

Risk-free interest rate
0.27
%
Dividend yield
—

Estimated fair value of stock options granted during the year
$
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 28, 2015
5,768,991

Authorized
2,379,645

Granted
(2,465,037
)
Canceled/forfeited
677,078

Balance at February 29, 2016
6,360,677
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,
 
2016

2015

2014
Expected volatility
43
%
 
45
%
 
46
%
Expected term (in years)
6.25

 
6.25

 
6.25

Risk-free interest rate
1.80
%
 
1.87
%
 
1.67
%
Dividend yield
—

 
—

 
—

Estimated fair value of stock options granted during the year
$
13.80

 
$
13.98

 
$
9.48
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)
 
(in thousands)
Balance at February 28, 2015
4,051,904

 
$
17.98

 
 
 
 
Granted
757,285

 
$
31.21

 
 
 
 
Exercised
(382,529
)
 
$
12.67

 
 
 
 
Canceled/forfeited
(218,459
)
 
$
26.16

 
 
 
 
Balance at February 29, 2016
4,208,201

 
$
20.42

 
 
 
 
As of February 29, 2016:
 
 
 
 
 
 
 
Vested and exercisable
2,478,287

 
$
16.34

 
6.20
 
$
1,456,297

Vested and expected to vest
4,063,692

 
$
20.02

 
7.03
 
$
1,565,624
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 28, 2015
1,576,332

 
$
23.16

Granted
1,707,752

 
$
25.75

Vested
(637,157
)
 
$
19.60

Canceled/forfeited
(196,108
)
 
$
29.53

Unvested at February 29, 2016
2,450,819

 
$
25.38

Expected to vest after February 29, 2016
2,167,186

 
$
25.40
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,
 
2016

2015

2014
Cost of revenue
$
1,062

 
$
389

 
$
201

Research and development
8,247

 
4,410

 
2,374

Sales and marketing
6,566

 
3,811

 
2,067

General and administrative
12,971

 
8,448

 
6,195

 
$
28,846

 
$
17,058

 
$
10,837
Summary of Common Stock Repurchases
The following table summarizes our common stock repurchases for fiscal 2016 (in thousands, except per share data):
 
Fiscal 2016
Total number of shares repurchased
1,503

Dollar amount of shares repurchased
$
19,216

Average price paid per share
$
12.79

Remaining amount authorized as of February 29, 2016
$
30,784