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Prepaid Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Prepaid expenses $ 10,254 $ 8,863
Prepaid R&D clinical costs 8,996 8,498
Prepaid insurance 745 181
Other prepaid costs $ 513 $ 184