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Balance Sheet Components - Other Noncurrent Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Indirect tax reserves $ 6,476 $ 4,137
Deferred rent 2,367 1,659
Other 2,150 908
Total other noncurrent liabilities $ 10,993 $ 6,704