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Stock-based Compensation (Tables)
 9 Months Ended
Oct. 31, 2018
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,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

 

(in thousands)

 

Stock-based compensation:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cost of revenue

 

$

310

 

 

$

343

 

 

$

942

 

 

$

978

 

Research and development

 

 

9,720

 

 

 

8,906

 

 

 

27,847

 

 

 

25,532

 

Selling, general and administrative

 

 

5,582

 

 

 

5,419

 

 

 

16,148

 

 

 

15,565

 

Total stock-based compensation

 

$

15,612

 

 

$

14,668

 

 

$

44,937

 

 

$

42,075

 
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,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Stock Options:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

 

53

%

 

 

53

%

 

 

54

%

 

 

53

%

Risk-free interest rate

 

 

2.78

%

 

 

1.78

%

 

 

2.75

%

 

 

2.02

%

Expected term (years)

 

5.45

 

 

6.08

 

 

 

5.40

 

 

6.07

 

Dividend yield

 

 

0

%

 

 

0

%

 

 

0

%

 

 

0

%

Employee stock purchase plan awards:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

 

44

%

 

 

50

%

 

 

45

%

 

 

45

%

Risk-free interest rate

 

2.35

 

 

 

1.17

%

 

 

2.15

%

 

 

1.03

%

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 period indicated:

 

 

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, 2018

 

 

1,611,344

 

 

$

24.56

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Granted

 

 

97,600

 

 

 

42.81

 

 

$

21.83

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

(207,770

)

 

 

5.12

 

 

 

 

 

 

$

8,196

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(16,732

)

 

 

54.28

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Expired

 

 

(9,007

)

 

 

47.55

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at October 31, 2018

 

 

1,475,435

 

 

 

28.03

 

 

 

 

 

 

 

 

 

 

4.68

 

 

$

20,331

 

Exercisable at October 31, 2018

 

 

1,254,926

 

 

$

24.13

 

 

 

 

 

 

 

 

 

 

 

3.96

 

 

$

20,327

 
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, 2018

 

 

2,103,281

 

 

$

56.45

 

Granted

 

 

1,319,200

 

 

 

39.94

 

Vested

 

 

(742,338

)

 

 

53.25

 

Forfeited

 

 

(35,330

)

 

 

51.72

 

Unvested at October 31, 2018

 

 

2,644,813

 

 

$

49.18