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Accrued Expenses
 12 Months Ended
Dec. 31, 2023
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consisted of the following (in thousands):
December 31,
20232022
Clinical study patient costs incurred but not yet invoiced$439 $1,393 
Accrued vacation, wages, bonuses, and related payroll taxes392 329 
Accrued other60 2 
Total$891 $1,724