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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]
Unbilled contract assets	$ 0	$ 180,000
Deferred revenues from associated contracts	0	(54,790)
Net unbilled contract assets	0	125,210
Prepaid assets	5,549	6,464
Other current assets	6,014	1,717
Total prepaid expenses and other current assets	$ 11,563	$ 133,391

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