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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]    
Unbilled contract assets $ 15,003 $ 2,147
Deferred revenues from associated contracts (7,003) (2,147)
Net unbilled contract assets 8,000 0
Prepaid assets 6,598 8,353
Other current assets 7,090 1,807
Total prepaid expenses and other current assets $ 21,688 $ 10,160