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Stock-based Compensation (Tables)
 9 Months Ended
Oct. 31, 2017
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,

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

 

 

(in thousands)

 

Stock-based compensation:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cost of revenue

 

$

343

 

 

$

282

 

 

$

978

 

 

$

773

 

Research and development

 

 

8,906

 

 

 

7,804

 

 

 

25,532

 

 

 

21,396

 

Selling, general and administrative

 

 

5,419

 

 

 

4,621

 

 

 

15,565

 

 

 

13,305

 

Total stock-based compensation

 

$

14,668

 

 

$

12,707

 

 

$

42,075

 

 

$

35,474

 

 
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,

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Stock Options:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

53

%

 

 

39

%

 

 

53

%

 

 

38

%

Risk-free interest rate

 

1.78

%

 

 

1.27

%

 

 

2.02

%

 

 

1.51

%

Expected term (years)

6.08

 

 

 

6.08

 

 

6.07

 

 

 

5.98

 

Dividend yield

 

0

%

 

 

0

%

 

 

0

%

 

 

0

%

Employee stock purchase plan awards:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

50

%

 

 

41

%

 

 

45

%

 

 

54

%

Risk-free interest rate

 

1.17

%

 

 

0.49

%

 

 

1.03

%

 

 

0.51

%

Expected term (years)

 

0.5

 

 

 

0.5

 

 

 

0.5

 

 

 

0.5

 

Dividend yield

 

0

%

 

 

0

%

 

 

0

%

 

 

0

%

 
Stock Option Activity

The following table summarizes stock option activity for the nine months ended October 31, 2017:

 

 

Options 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, 2017

 

 

1,703,524

 

 

$

21.66

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Granted

 

 

91,300

 

 

 

52.57

 

 

$

27.20

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

(135,180

)

 

 

12.34

 

 

 

 

 

 

$

5,569

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(21,057

)

 

 

56.87

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Expired

 

 

(18,045

)

 

 

30.88

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at October 31, 2017

 

 

1,620,542

 

 

 

23.62

 

 

 

 

 

 

 

 

 

 

4.74

 

 

$

55,763

 

Exercisable at October 31, 2017

 

 

1,351,300

 

 

$

17.95

 

 

 

 

 

 

 

 

 

 

 

4.06

 

 

$

53,559

 

 
Restricted Stock and Restricted Stock Units Activities

The following table summarizes restricted stock and restricted stock units activities for the period indicated:

 

 

 

 

 

 

 

Weighted-

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

Grant-Date

 

 

 

Shares

 

 

Fair Value

 

Unvested at January 31, 2017

 

 

2,175,673

 

 

$

56.76

 

Granted

 

 

1,001,785

 

 

 

46.50

 

Vested

 

 

(767,449

)

 

 

45.84

 

Forfeited

 

 

(99,863

)

 

 

54.66

 

Unvested at October 31, 2017

 

 

2,310,146

 

 

$

56.03