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Prepaid Expenses
3 Months Ended
Mar. 31, 2022
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]  
Prepaid Expenses

8. Prepaid expenses

As of March 31, 2022, prepaid expenses were $5,113, consisting of $2,167 of prepaid R&D clinical costs, $2,134 of prepaid insurance and $812 of other prepaid costs. As of December 31, 2021, prepaid expenses were $2,519, consisting of $1,481 of prepaid R&D clinical costs, $369 of prepaid insurance, and $669 of other prepaid costs.