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Prepaid expenses
 12 Months Ended
Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid expenses Prepaid expenses
Prepaid expenses consisted of the following (in thousands):
December 31,
20232022
Clinical trial and other development costs$59 $38 
Insurance3,558 2,027 
Other — 434 
Total prepaid expenses$3,617 $2,499