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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense
Stock-based compensation expense for stock options, RSUs, and PSUs is reflected in the consolidated statements of operations and comprehensive loss as follows (in thousands):
Year ended December 31,
20242023
General and administrative$5,269 $6,876 
Research and development2,158 2,341 
Total$7,427 $9,217 
Schedule of Weighted Average Assumptions Utilized in Fair Value
The assumptions utilized in the fair value calculations for stock options as of December 31, 2024 and 2023 were as follows:
Year ended December 31,
20242023
Weighted average expected option term (years)5.95.9
Range of expected stock price volatility
104% – 112%
103% – 109%
Weighted average expected stock price volatility108%106%
Range of risk-free interest rate
3.4% – 4.6%
3.5% – 4.4%
Expected dividend rate0%0%
Schedule of Stock Option Activity
The following table summarizes the stock option activity:
Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Life (Years)Aggregate Intrinsic Value (In Thousands)
Options outstanding at December 31, 202313,161,228 $2.38 7.86$337 
Granted4,055,895 0.96 
Exercised(284,788)0.57 183 
Forfeited(735,187)3.52 
Options outstanding at December 31, 202416,197,148 $2.01 7.40$1,128 
Vested and expected to vest at December 31, 202416,197,148 $2.01 7.40$1,128 
Options exercisable at December 31, 20249,687,991 $2.40 6.60$731 
Schedule of RSU Activity
The following table summarizes the RSU activity:
Number of SharesWeighted Average Grant-Date Fair ValueAggregate Intrinsic Value (In Thousands)
RSUs unvested at December 31, 20232,982,661 $1.63 $1,715 
Granted39,738 0.51 22 
Vested(1,063,537)1.85 768 
Forfeited(56,405)1.64 59 
RSUs unvested at December 31, 20241,902,457 $1.49 $1,531 
Schedule of PSU Activity
The following table summarizes the unvested PSU activity:
Number of SharesWeighted Average Grant-Date Fair Value
PSUs unvested at December 31, 2023— $— 
Granted872,352$1.71 
Vested— $— 
Forfeited— $— 
PSUs unvested at December 31, 2024872,352 $1.71