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Other Financial Statement Information - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Other Financial Statement Information [Abstract]    
Prepaid insurance $ 1,837 $ 27
Prepaid contract costs 889  
Deposits 57 86
Receivables on exercise of options   52
Other 786 392
Prepaid expenses and other current assets $ 3,569 $ 557