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Balance Sheet Components - Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Balance Sheet Components Disclosure [Abstract]    
Trade receivables $ 454,399 $ 362,712
Prepaid expenses 180,999 178,833
Other receivables 524,669 206,921
Total other current assets $ 1,160,067 $ 748,466