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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of stock-based compensation by award type Stock-based compensation by award type was as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
 2022202120222021
Stock options$4,021 $1,485 $11,095 $3,997 
Restricted stock units2,444 1,101 7,020 2,896 
Employee stock purchase plan91 40 215 104 
Total$6,556 $2,626 $18,330 $6,997 
Schedule of allocated stock-based compensation expense
The Company allocated stock-based compensation expense in the Company’s Consolidated Statements of Operations and Comprehensive Loss as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
 2022202120222021
Research and development$2,681 $1,476 $8,108 $4,138 
General and administrative3,875 1,150 10,222 2,859 
Total$6,556 $2,626 $18,330 $6,997 
Summary of the stock option activity including weighted average exercise prices, options outstanding and exercisable
A summary of the stock option activity, weighted average exercise prices, options outstanding, exercisable and expected to vest as of September 30, 2022 is as follows (in thousands except weighted average exercise price):
 Number of Shares Underlying OptionsWeighted
Average
Exercise
Price
Outstanding, December 31, 202110,861 $10.94 
Granted1,388 $14.23 
Exercised(1,797)$3.69 
Forfeited(202)$14.14 
Outstanding, September 30, 202210,250 $12.60 
Vested and exercisable, September 30, 20224,830 $13.38 
Vested and expected to vest, September 30, 20229,762 $12.63 
Summary of outstanding shares of RSU awards
The following table presents a summary of the Company's outstanding RSU awards granted as of September 30, 2022 (in thousands except weighted average grant-date fair value):
Restricted
Stock
Units		Weighted Average
Grant-Date
Fair Value
Outstanding, December 31, 20212,246 $9.82 
Awarded494 $11.79 
Vested(293)$8.32 
Forfeited(46)$10.95 
Outstanding, September 30, 20222,401 $10.39 
Outstanding, expected to vest2,185 $10.39