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Stock-Based Compensation (Tables)
 9 Months Ended
Jan. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
A summary of the Company’s option activity during the periods indicated was as follows:
Options Outstanding
Number of
Stock Options
Outstanding		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life (years)		Aggregate
Intrinsic
Value
(in thousands)(in thousands)
Balance as of April 30, 202032,877 $3.48 8.03$116,962 
Options granted14,415 11.12 
Options exercised(4,563)3.06 
Options cancelled(2,559)5.55 
Balance as of January 31, 202140,170 $6.13 8.05$449,073 
Vested and exercisable as of January 31, 202112,799 $3.01 6.45$180,395 
Vested and expected to vest as of January 31, 202141,161 $6.12 8.07$460,444 
Schedule of Valuation Assumptions The weighted average assumptions underlying the fair value estimation are provided in the following table:
Nine Months Ended January 31, 2021
Valuation assumptions:
Expected dividend yield0.0 %
Expected volatility43.8 %
Expected term (years)6.3
Risk-free interest rate0.43 %
Summary of Effects of Stock-Based Compensation
The following table summarizes the effects of stock-based compensation on the Company’s consolidated statements of operations (in thousands):
Three Months Ended January 31,Nine Months Ended January 31,
2021202020212020
Cost of subscription$214 $104 $557 $246 
Cost of professional services164 30 301 93 
Sales and marketing2,790 613 5,835 1,894 
Research and development846 308 1,952 910 
General and administrative2,575 1,006 5,625 2,281 
Total stock-based compensation expense$6,589 $2,061 $14,270 $5,424