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Stock Compensation (Tables)
 3 Months Ended
Mar. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Summary of Activity Relating to the Company's Options and Performance-Based Options to Purchase Common Stock
The following table summarizes the activity relating to the Company’s options to purchase Common Stock for the three months ended March 31, 2025:
Number of OptionsWeighted-Average Exercise Price Per ShareWeighted-Average Remaining Contractual Term (Years)Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 20245,177,511 $8.70 7.43$480 
Granted1,762,000 $1.50 
Forfeited or expired(49,596)$49.12 
Exercised— $— 
Outstanding at March 31, 20256,889,915 $6.56 7.92$12 
Vested and expected to vest at March 31, 20256,889,915 $6.56 7.92$12 
Exercisable at March 31, 20252,823,592 $12.76 6.13$12 
The following table summarizes the activity relating to the Company’s PBSOs for the three months ended March 31, 2025:
Number of OptionsWeighted-Average Exercise Price Per ShareWeighted-Average Remaining Contractual Term (Years)Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 2024632,950 $4.97 6.35$123 
Granted— $— 
Forfeited or expired— $— 
Exercised— $— 
Outstanding at March 31, 2025632,950 $4.97 5.98$— 
Vested and expected to vest at March 31, 2025632,950 $4.97 5.98$— 
Exercisable at March 31, 2025632,950 $4.97 5.98$— 
Summary of Activity Relating to the Company's RSUs
The following table summarizes the activity relating to the Company’s RSUs for the three months ended March 31, 2025:
Number of
RSUs		Weighted-Average
Fair Value Per
Share
Outstanding and unvested December 31, 20244,447,074 $2.83 
Granted5,312,350 $1.50 
Forfeited(230,996)$3.02 
Vested(461,779)$3.70 
Outstanding and unvested March 31, 20259,066,649 $2.00 
Summary of Total Stock Based Compensation Expense
The following table summarizes the total stock-based compensation expense in each of the income statement line items for the three months ended March 31, 2025 and 2024:
Three months ended March 31
(in thousands)
2025
2024
Research and development$369 $904 
Selling, general and administrative2,096 2,331 
Total stock compensation expense
$2,465 $3,235