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Stock Compensation (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 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 
Granted2,161,040 $1.39 
Forfeited or expired(474,308)$14.32 
Exercised— $— 
Outstanding at June 30, 20256,864,243 $6.01 7.36$41 
Vested and expected to vest at June 30, 20256,864,243 $6.01 7.36$41 
Exercisable at June 30, 20253,417,015 $10.02 5.85$— 
The following table summarizes the activity relating to the Company’s PBSOs for the six months ended June 30, 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(8,950)$1.62 
Exercised— $— 
Outstanding at June 30, 2025624,000 $5.01 5.24$— 
Vested and expected to vest at June 30, 2025624,000 $5.01 5.24$— 
Exercisable at June 30, 2025624,000 $5.01 5.24$— 
Summary of Activity Relating to the Company's RSUs
The following table summarizes the activity relating to the Company’s RSUs for the six months ended June 30, 2025:
Number of
RSUs		Weighted-Average
Fair Value Per
Share
Outstanding and unvested December 31, 20244,447,074 $2.83 
Granted5,498,930 $1.48 
Forfeited(620,713)$2.28 
Vested(1,291,169)$2.92 
Outstanding and unvested June 30, 20258,034,122 $1.94 
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 and six months ended June 30, 2025 and 2024:
Three months ended June 30
Six months ended June 30
(in thousands)
(in thousands)
2025
2024
20252024
Research and development$412 $674 $781 $1,578 
Selling, general and administrative2,257 2,257 4,353 4,588 
Total stock compensation expense
$2,669 $2,931 $5,134 $6,166