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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2025
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,
20252024
General and administrative$4,615 $5,269 
Research and development3,092 2,158 
Total$7,707 $7,427 
Schedule of Weighted Average Assumptions Utilized in Fair Value
The assumptions utilized in the fair value calculations for stock options as of December 31, 2025 and 2024 were as follows:
Year ended December 31,
20252024
Weighted average expected option term (years)6.05.9
Range of expected stock price volatility
107% – 113%
104% – 112%
Weighted average expected stock price volatility110%108%
Range of risk-free interest rate
3.6% – 4.4%
3.4% – 4.6%
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, 202416,197,148 $2.01 7.4$1,128 
Granted10,311,273 0.96 06 
Exercised(297,702)0.45 0204 
Forfeited(1,261,400)2.14 080 
Expired(387,569)2.14 06 
Options outstanding at December 31, 202524,561,750 $1.58 7.6$7,505 
Vested and expected to vest at December 31, 202524,561,750 $1.58 7.6$7,505 
Options exercisable at December 31, 202511,378,906 $2.28 6.07$2,400 
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, 20241,902,457 $1.49 $1,531 
Granted— — — 
Vested(1,021,866)1.81 930 
Forfeited(28,939)0.91 24 
RSUs unvested at December 31, 2025851,652 $1.13 $1,150 
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, 2024872,352 $1.71 
Granted3,314,445 $1.58 
Vested— $— 
Forfeited— $— 
PSUs unvested at December 31, 20254,186,797 $1.61