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Stock-based Compensation (Tables)
 9 Months Ended
Oct. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Classification of Stock-based Compensation

The following table presents the classification of stock-based compensation for the periods indicated:

 

 

 

Three Months Ended October 31,

 

 

Nine Months Ended October 31,

 

 

 

2016

 

 

2015

 

 

2016

 

 

2015

 

 

 

(in thousands)

 

Stock-based compensation:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cost of revenue

 

$

282

 

 

$

157

 

 

$

773

 

 

$

408

 

Research and development

 

 

7,804

 

 

 

5,201

 

 

 

21,396

 

 

 

11,966

 

Selling, general and administrative

 

 

4,621

 

 

 

2,587

 

 

 

13,305

 

 

 

7,174

 

Total stock-based compensation

 

$

12,707

 

 

$

7,945

 

 

$

35,474

 

 

$

19,548

 

 
Weighted-Average Assumptions Used to Estimate Fair Value

The following table sets forth the weighted-average assumptions used to estimate the fair value of stock options and employee stock purchase plan awards for the periods indicated:

 

 

Three Months Ended October 31,

 

 

Nine Months Ended October 31,

 

 

2016

 

 

2015

 

 

2016

 

 

2015

 

Stock Options:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

39

%

 

 

55

%

 

 

38

%

 

 

57

%

Risk-free interest rate

 

1.27

%

 

 

1.70

%

 

 

1.51

%

 

 

1.73

%

Expected term (years)

6.08

 

 

 

6.08

 

 

5.98

 

 

 

6.08

 

Dividend yield

 

0

%

 

 

0

%

 

 

0

%

 

 

0

%

Employee stock purchase plan awards:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

41

%

 

 

63

%

 

 

54

%

 

 

63

%

Risk-free interest rate

 

0.49

%

 

 

0.27

%

 

 

0.51

%

 

 

0.21

%

Expected term (years)

 

0.5

 

 

 

0.5

 

 

 

0.5

 

 

 

0.5

 

Dividend yield

 

0

%

 

 

0

%

 

 

0

%

 

 

0

%

 
Stock Option Activities

The following table summarizes stock option activities for the nine months ended October 31, 2016:

 

 

 

Option Outstanding

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total Intrinsic

 

 

Average

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted-

 

 

Value of

 

 

Remaining

 

 

Aggregate

 

 

 

 

 

 

 

Weighted-

 

 

Average

 

 

options

 

 

Contractual

 

 

Intrinsic

 

 

 

 

 

 

 

Average

 

 

Grant-date

 

 

Exercised

 

 

Term

 

 

Value

 

 

 

Shares

 

 

Exercise Price

 

 

Fair Value

 

 

(in thousands)

 

 

(in years)

 

 

(in thousands)

 

Outstanding at January 31, 2016

 

 

1,853,390

 

 

$

19.36

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Granted

 

 

93,100

 

 

 

46.10

 

 

$

17.99

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

(205,018

)

 

 

13.98

 

 

 

 

 

 

$

9,469

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(10,753

)

 

 

50.76

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Expired

 

 

(7,721

)

 

 

14.12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at October 31, 2016

 

 

1,722,998

 

 

 

21.27

 

 

 

 

 

 

 

 

 

 

5.39

 

 

$

71,043

 

Exercisable at October 31, 2016

 

 

1,345,458

 

 

$

13.81

 

 

 

 

 

 

 

 

 

 

 

4.57

 

 

$

64,650

 

 
Restricted Stock Activities

The following table summarizes restricted stock activities for the periods indicated:

 

 

 

 

 

 

 

Weighted-

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

Grant-Date

 

 

 

Shares

 

 

Fair Value

 

Unvested at January 31, 2016

 

 

2,495,488

 

 

$

47.04

 

Granted

 

 

662,573

 

 

 

67.91

 

Vested

 

 

(704,225

)

 

 

36.48

 

Forfeited

 

 

(22,030

)

 

 

45.94

 

Unvested at October 31, 2016

 

 

2,431,806

 

 

$

55.60