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Prepaid Expenses
9 Months Ended
Sep. 30, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]  
Prepaid Expenses

7. Prepaid expenses

As of September 30, 2021, prepaid expenses were $6,258, consisting of $4,098 of prepaid R&D clinical costs, $855 of prepaid insurance and $1,305 of other prepaid costs. As of December 31, 2020, prepaid expenses were $12,076, consisting of $11,286 of prepaid R&D clinical costs, $223 of prepaid insurance, and $567 of other prepaid costs.