Balance Sheet Components - Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Balance Sheet Components Disclosure [Abstract]
Trade receivables	$ 604,789	$ 454,399
Prepaid expenses	209,218	180,999
Other	620,082	524,669
Total other current assets	$ 1,434,089	$ 1,160,067