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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]
Unbilled contract assets	$ 130,000	$ 180,000
Deferred revenues from associated contracts	(3,442)	(54,790)
Net unbilled contract assets	126,558	125,210
Prepaid assets	5,267	6,464
Other current assets	2,203	1,717
Total prepaid expenses and other current assets	$ 134,028	$ 133,391

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