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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid corporate insurance $ 1,436 $ 562
Prepaid other and other current assets 432 373
Prepaid R&D costs 187 333
Total prepaid expenses and other current assets $ 2,055 $ 1,268