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Stock-Based Compensation (Tables)
 6 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
A summary of the stock option activity under the Company’s equity incentive plans is as follows:
 Options Outstanding
 Number of
options		Weighted-
Average
Exercise Price		Remaining
Contractual
Term (Years)		Aggregate
Intrinsic Value
(in thousands)
Balance - March 31, 20203,873,888 $8.33 9.37$28,029 
Granted2,290,978 23.51 
Exercised(42,213)4.31 
Forfeited(61,738)14.86 
Canceled(226,233)7.86 
Balance - September 30, 20205,834,682 $14.27 9.21$122,505 
Exercisable - September 30, 2020945,851 $8.08 8.74$25,646 
Schedule of Fair Value Assumptions
The Company estimated the fair value of each option on the date of grant using the Black-Scholes option pricing model applying the weighted-average assumptions in the following table:
 Three Months Ended September 30,Six Months Ended September 30,
 2020201920202019
Risk-free interest rate
0.30% - 0.40%
1.88% - 1.88%
0.30% - 0.44%
1.78% - 2.25%
Expected term, in years
5.81 - 6.11
6.05 - 6.11
5.56 - 6.11
5.75 - 6.11
Expected volatility
83.31% - 84.05%
75.67% - 75.73%
78.16% - 84.05%
74.69% - 75.73%
Expected dividend yield—%—%—%—%
Schedule of Restricted Stock Unit Awards Activity
A summary of RSUs activity under the Company’s equity incentive plans is as follows:
Number of RSUsWeighted- Average Grant Date Fair Value
Unvested as of March 31, 2020— $— 
Issued127,200 19.01 
Unvested as of September 30, 2020127,200 $19.01 
Summary of Stock-based Compensation Expense
For the three and six months ended September 30, 2020 and 2019, stock-based compensation expense under the Company’s equity incentive plans was as follows (in thousands):
 Three Months Ended September 30,Six Months Ended September 30,
 2020201920202019
Research and development expenses$951 $2,306 $1,370 $2,369 
General and administrative expenses2,356 813 5,855 1,287 
Total stock-based compensation$3,307 $3,119 $7,225 $3,656