Prepaid Expenses

9 Months Ended

Sep. 30, 2019

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Prepaid Expenses

7. Prepaid expenses

As of September 30, 2019, prepaid expenses were $8,556, consisting of $7,751 of prepaid R&D clinical costs, $481 of prepaid insurance and $324 of other prepaid costs. As of December 31, 2018, prepaid expenses were $4,805, consisting of $4,377 of prepaid R&D clinical costs, $245 of prepaid insurance, and $183 of other prepaid costs.