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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

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