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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
The following table summarizes the stock option activity:

Number of OptionsWeighted Average Exercise Price
Outstanding at December 31, 2024
4,985,886 $5.41 
Granted— $— 
Exercised(75,000)$5.13 
Forfeited/Cancelled(1,354,750)$5.31 
Outstanding at September 30, 2025
3,556,136 $5.45 
Schedule of Restricted Stock Unit Activity
The following table summarizes the RSU activity under the 2021 Equity Incentive Plan and the 2023 Inducement Plan:

Number of SharesWeighted Average Grant Date Fair Value Per Share
Non-Employee DirectorsDirectors, Officers and Employees Non-Employee DirectorsDirectors, Officers and Employees
Unvested RSUs at December 31, 2024
726,573 6,956,604 $2.70 $2.81 
Granted39,061 2,600,925 $6.93 $5.06 
Vested(530,052)(2,340,819)$2.99 $2.98 
Forfeited— (877,929)$— $2.27 
Unvested RSUs at September 30, 2025
235,582 6,338,781 $2.75 $3.75 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions
The following table summarizes the key input assumptions used in the Black-Scholes option-pricing model to estimate the grant-date fair value of the 2021 ESPP:
September 30, 2025
Expected life of options (in years)0.50
Expected stock price volatility63.10%—70.18%
Risk free interest rate4.32%—4.44%
Expected dividend yield—%
Weighted average grant-date fair value per share $1.81—$2.56
Schedule of Stock-Based Compensation Expense
Stock-based compensation expense related to RSU awards under the 2021 Equity Incentive Plan and the 2023 Inducement Plan, 2021 ESPP purchases and stock options, as applicable, are as follows:

For the three months ended September 30,For the nine months ended September 30,
2025202420252024
(In thousands)
Selling, general and administrative$2,200 $2,012 $6,936 $13,164 
Research and development199 154 590 429 
Total stock-based compensation expense$2,399 $2,166 $7,526 $13,593