Equity Incentive Plans and Employee Stock Purchase Plan (Tables)
 3 Months Ended
Apr. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock option activity
The following table summarizes stock option activity for the three months ended April 30, 2018 (in thousands, except share and per share data and years):
 
Shares
 
Weighted-
Average
Exercise
Price Per
Share
 
Weighted-
Average
Remaining
Contractual
Term
(In Years)
 
Aggregate
Intrinsic
Value
Balance - January 31, 2018
12,637,435

 
$
7.63

 
7.72
 
$
246,227

Stock options granted
—

 
—

 
 
 
 
Stock options exercised
(40,723
)
 
6.36

 
 
 
 
Repurchase of early exercised shares
—

 
—

 
 
 
 
Stock options forfeited and expired
(123,781
)
 
9.22

 
 
 
 
Balance - April 30, 2018
12,472,931

 
7.61

 
7.44
 
353,927

Vested and exercisable - January 31, 2018
5,540,858

 
6.33

 
6.63
 
115,122

Vested and exercisable - April 30, 2018
6,236,117

 
$
6.46

 
6.51
 
$
184,152
Schedule of restricted stock unit activity
The following table summarizes RSU activity for the three months ended April 30, 2018:
 
Shares
 
Weighted-Average Grant Date Fair Value per RSU
Unvested - January 31, 2018
245,746

 
$
26.20

RSUs granted
1,050,660

 
39.52

RSUs vested
(125
)
 
28.87

RSUs forfeited and canceled
—

 
—

Unvested - April 30, 2018
1,296,281

 
37.00
Schedule of stock-based compensation expense recognized in consolidated statements of operations
Total stock-based compensation expense recognized in the Company’s interim unaudited condensed consolidated statements of operations is as follows (in thousands):
 
Three Months Ended April 30,
 
2018
 
2017
Cost of revenue—subscription
$
359

 
$
151

Cost of revenue—services
184

 
72

Sales and marketing
2,218

 
1,215

Research and development
2,206

 
1,245

General and administrative
2,610

 
1,771

Total stock-based compensation expense
$
7,577

 
$
4,454