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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]
Unbilled contract assets	$ 180,000	$ 0
Deferred revenues from associated contracts	(52,019)	0
Net unbilled contract assets	127,981	0
Prepaid assets	4,716	2,705
Other current assets	3,899	2,224
Total prepaid expenses and other current assets	$ 136,596	$ 4,929

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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