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Balance Sheet Components - Deferred Revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]      
Deferred revenues $ 393,138 $ 267,713  
Deferred Revenue, Noncurrent 17,051 4,588  
Net revenues 1,966,492 1,473,413 $ 1,079,874
Contract with Customer, Liability, Revenue Recognized $ 180,600 $ 119,000