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Prepaid expenses
 12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid expenses Prepaid expenses
Prepaid expenses consisted of the following (in thousands):
December 31,
20212020
Clinical trial and other development costs$2,169 $2,551 
Insurance1,555 1,701 
Other 313 286 
Total prepaid expenses$4,037 $4,538