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Equity Incentive Plans (Tables)
 3 Months Ended
Apr. 30, 2020
Equity [Abstract]  
Schedule of Plan Activity
The Plan activity is as follows:
Three Months Ended
April 30, 2020
Opening balance23,050,732  
Shares authorized (1)
6,617,320  
Options and RSUs granted(2,828,278) 
Cancelled shares568,255  
Ending balance27,408,029  
(1) Reflects an automatic increase to the number of shares of Common Stock reserved for issuance pursuant to future awards under the 2019 Plan, which annual increase is provided for in the 2019 Plan.
Stock-Based Compensation Expense
The stock-based compensation expense by line item in the unaudited condensed consolidated statements of operations is summarized as follows (in thousands):

Three Months Ended April 30,
20202019
Cost of subscription revenue$909  $287  
Cost of professional services revenue2,684  557  
Research and development expense11,473  1,583  
Sales and marketing expense9,335  1,493  
General and administrative expense7,403  4,042  
Total stock-based compensation$31,804  $7,962  
Stock Option Activity
The following table summarizes the stock option activity:

Options Outstanding
Number of
Shares		Average
Exercise
Price per
Share		Weighted
Average
Remaining
Contractual
Term 
(years)		Aggregate
Intrinsic
Value
(in thousands)
Balance as of January 31, 202041,935,173  $5.47  7.29$954,124  
Options granted—  —  
Options exercised(5,184,632) 3.65  92,667  
Options cancelled or expired(296,847) 6.36  
Balance as of April 30, 202036,453,694  $5.72  7.31$574,497  
Exercisable as of April 30, 202023,125,246  $5.25  6.79$375,356  
Restricted Stock Unit Activity
The following table summarizes restricted stock unit activities:
Restricted Stock UnitsPerformance Based
Restricted Stock
Units
Number of
Shares		Weighted
Average
Grant
Date Fair
Value		Number
of Shares		Weighted
Average
Grant
Date Fair
Value
Balance as of January 31, 20209,019,681  $16.07  826,333  $13.95  
Stock units granted2,478,333  22.48  349,945  22.30  
Stock units vested(1,671,652) 12.62  —  —  
Stock units cancelled and expired(204,208) 22.41  (67,200) 13.41  
Balance as of April 30, 20209,622,154  $18.19  1,109,078  $16.62  
ESPP Valuation Assumptions
The fair value of each Employee Stock Purchase Plan (ESPP) share is estimated on the enrollment date of the offering period using the Black-Scholes-Merton option-pricing model and the assumptions noted in the following table:

April 30, 2020
Risk-free interest rate0.3%
Expected volatility45%
Expected term (in years)0.5
Expected dividend rate—