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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]
Unbilled contract assets	$ 180,000	$ 0
Deferred revenues from associated contracts	(54,790)	0
Net unbilled contract assets	125,210	0
Prepaid assets	6,464	2,705
Other current assets	1,717	2,224
Total prepaid expenses and other current assets	$ 133,391	$ 4,929

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