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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Options Activity
The following table sets forth the summary of options activity, under the 2018 Plan and the 2021 Plans, for the six months ended June 30, 2024:
(in thousands, except share-based data)Total OptionsWeighted- Average Exercise Price Per ShareWeighted- Average Remaining Contractual Term (In Years)Aggregate Intrinsic Value
Outstanding as of December 31, 202323,912 $68.39 
Forfeitures(3,912)11.62 
Outstanding as of June 30, 202420,000 $79.49 6.9$— 
Exercisable as of June 30, 202417,103 $71.44 6.7$— 
Vested and expected to vest as of June 30, 202420,000 $79.49 6.9$— 
Schedule of Restricted Stock Unit and Restricted Stock Award Activity
The following table sets forth the summary of RSU and RSA activity, under the Initial Plan, the 2018 Plan, the 2021 Plan, and the 2022 Plan, for the six months ended June 30, 2024. RSAs were an immaterial portion of activity for the period:
SharesWeighted Average Grant Date Fair Value (i.e. Share Price)
Outstanding as of December 31, 2023219,720 $86.78
Vested(36,570)67.15 
Forfeited(67,371)49.65 
Outstanding as of June 30, 2024115,779 $114.59 
Schedule of Stock-Based Compensation Expense
The following table sets forth the stock-based compensation under the Initial Plan, the 2018 Plan, the 2021 Plan, and the 2022 Plan by expense type:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Research and development expenses$297 $681 $224 $1,157 
Selling, general and administrative expenses1,438 1,896 2,954 3,140 
Total$1,735 $2,577 $3,178 $4,297 
The following table sets forth the stock-based compensation under the Initial Plan, the 2018 Plan, the 2021 Plan, and the 2022 Plan by award type:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Options$70 $92 $145 $188 
RSUs & RSAs1,665 2,499 3,033 4,099 
ESPP— (14)— 10 
Total$1,735 $2,577 $3,178 $4,297