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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-Based Payment Arrangement, Expensed and Capitalized, Amount
Total stock-based compensation expense was as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
General and administrative$529 $2,153 $978 $8,474 
Research and development139 334 172 1,154 
Total stock-based compensation expense from continuing operations668 2,487 1,150 9,628 
Stock-based compensation expense from discontinued operations— (2,078)— (2,022)
Total stock-based compensation expense$668 $409 $1,150 $7,606