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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]
Unbilled contract assets	$ 7,721	$ 2,147
Deferred revenues from associated contracts	(3,691)	(2,147)
Net unbilled contract assets	4,030	0
Prepaid assets	9,602	8,353
Other current assets	2,523	1,807
Total prepaid expenses and other current assets	$ 16,155	$ 10,160

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