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Other Financial Statement Information - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Financial Information [Abstract]
Prepaid expenses	$ 11,221	$ 7,177
Deferred cost of revenue	2,369	1,967
Other current assets	2,748	1,392
Total prepaid expenses and other current assets	$ 16,338	$ 10,536

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