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Financial Statement Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial Statement Components [Abstract]    
Prepaid expenses $ 2,437 $ 2,199
Other current assets 2,403 809
Prepaid expenses and other current assets $ 4,840 $ 3,008