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Composition of Certain Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Prepaid Expense And Other Assets [Abstract]    
Contract assets $ 1,670 $ 540
Restricted cash 560 560
Other 4,218 5,713
Total prepaid expenses and other current assets $ 6,448 $ 6,813