Quarterly report pursuant to Section 13 or 15(d)

Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail)

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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Prepaid research and development services $ 832 $ 1,535
Prepaid insurance 798 362
Other prepaid expenses 1,165 19
Other receivables 0 2,876
Other current assets 369 373
Total prepaid expenses and other current assets $ 3,164 $ 5,165