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Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Prepaid research and development services $ 1,300 $ 1,535
Prepaid insurance 115 362
Other prepaid expenses 525 19
Other receivables 1,000 2,876
Other current assets 370 373
Total prepaid expenses and other current assets $ 3,310 $ 5,165