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Prepaid Expenses
6 Months Ended
Jun. 30, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]  
Prepaid Expenses

7. Prepaid expenses

As of June 30, 2020, prepaid expenses were $10,124, consisting of $8,499 of prepaid R&D clinical costs, $1,170 of prepaid insurance and $455 of other prepaid costs. As of December 31, 2019, prepaid expenses were $8,863, consisting of $8,498 of prepaid R&D clinical costs, $181 of prepaid insurance, and $184 of other prepaid costs.