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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2023
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 June 30,Six months ended June 30,
2023202220232022
General and administrative$1,987 $1,495 $3,939 $3,711 
Research and development645 584 1,382 1,667 
Total$2,632 $2,079 $5,321 $5,378 
Schedule of Company's Stock Option Activity
The following table summarizes the Company's stock option activity:
Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Life (years)Aggregate Intrinsic Value
(in thousands)
Stock options outstanding at December 31, 2022
10,851,287 $2.95 8.3$1,385 
Granted4,722,889 $1.07 
Exercised(240,000)$0.41 
Forfeited(1,195,241)$2.63 
Stock options outstanding at June 30, 2023
14,138,935 $2.40 8.4$236 
Stock options exercisable at June 30, 2023
6,465,712 $2.70 7.6$176 
Share-based Payment Arrangement, Restricted Stock Unit, Activity
The following table summarizes the Company's RSU activity:
Number of SharesWeighted Average Grant Date Fair Value
RSUs outstanding at December 31, 2022
924,810 $4.12 
Granted3,186,442 $1.20 
Vested(245,758)$4.44 
Forfeited(418,671)$1.83 
RSUs outstanding at June 30, 2023
3,446,823 $1.68