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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense for Options Granted Reflected in the Consolidate Statement of Operations and Comprehensive Loss Stock-based compensation expense for stock options and RSUs is reflected in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):
Three months ended March 31,
20222021
General and administrative$2,216 $590 
Research and development1,083 243 
Total$3,299 $833 
Schedule of Stock Option Activity
The following table summarizes the stock option activity:
Number of SharesWeighted-Average Exercise PriceWeighted Average Remaining Contractual LifeAggregate Intrinsic Value
Options outstanding at December 31, 2021
10,086,167 $2.59 8.8$24,664 
Granted4,323,937 $4.42 
Exercised(277,323)$0.65 
Forfeited(130,327)$6.48 
Options outstanding at March 31, 2022
14,002,454 $3.16 8.9$14,468 
Options exercisable at March 31, 2022
2,913,960 $2.37 8.3$4,431 
Share-based Payment Arrangement, Restricted Stock Unit, Activity
The following table summarizes the RSU activity:
Number of SharesWeighted-Average Grant-Date Fair Value
RSUs outstanding at December 31, 2021
191,811 $6.79 
Granted1,130,270 $4.45 
Forfeited(20,812)$6.36 
RSUs outstanding at March 31, 2022
1,301,269 $4.76