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Financial Statement Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Financial Statement Components [Abstract]      
Prepaid expenses $ 5,394   $ 2,437
Other current assets 2,052   2,403
Contract assets 991 $ 736 0
Prepaid expenses and other current assets $ 8,437   $ 4,840