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Stock-based Compensation (Tables)
 6 Months Ended
Jul. 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 July 31,

 

 

Six Months Ended July 31,

 

 

 

2016

 

 

2015

 

 

2016

 

 

2015

 

 

 

(in thousands)

 

Stock-based compensation:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cost of revenue

 

$

246

 

 

$

127

 

 

$

491

 

 

$

251

 

Research and development

 

 

6,873

 

 

 

3,671

 

 

 

13,592

 

 

 

6,765

 

Selling, general and administrative

 

 

4,347

 

 

 

2,323

 

 

 

8,684

 

 

 

4,587

 

Total stock-based compensation

 

$

11,466

 

 

$

6,121

 

 

$

22,767

 

 

$

11,603

 

 
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 July 31,

 

 

Six Months Ended July 31,

 

 

2016

 

 

2015

 

 

2016

 

 

2015

 

Stock Options:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

38

%

 

 

57

%

 

 

38

%

 

 

59

%

Risk-free interest rate

 

1.39

%

 

 

1.85

%

 

 

1.55

%

 

 

1.76

%

Expected term (years)

6.08

 

 

 

6.08

 

 

5.96

 

 

 

6.08

 

Dividend yield

 

0

%

 

 

0

%

 

 

0

%

 

 

0

%

Employee stock purchase plan awards:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

—

 

 

 

—

 

 

 

67

%

 

 

63

%

Risk-free interest rate

 

—

 

 

 

—

 

 

 

0.52

%

 

 

0.15

%

Expected term (years)

 

—

 

 

 

—

 

 

 

0.5

 

 

 

0.5

 

Dividend yield

 

—

 

 

 

—

 

 

 

0

%

 

 

0

%

 
Stock Option Activities

The following table summarizes stock option activities for the six months ended July 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

 

 

78,700

 

 

 

41.93

 

 

$

16.38

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

(65,836

)

 

 

10.96

 

 

 

 

 

 

$

2,176

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(8,625

)

 

 

52.43

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Expired

 

 

(7,721

)

 

 

14.12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at July 31, 2016

 

 

1,849,908

 

 

 

20.48

 

 

 

 

 

 

 

 

 

 

5.59

 

 

$

71,725

 

Exercisable at July 31, 2016

 

 

1,430,350

 

 

$

13.00

 

 

 

 

 

 

 

 

 

 

 

4.75

 

 

$

65,004

 

 
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

 

 

25,504

 

 

 

43.64

 

Vested

 

 

(464,699

)

 

 

35.56

 

Forfeited

 

 

(11,703

)

 

 

46.10

 

Unvested at July 31, 2016

 

 

2,044,590

 

 

$

48.03