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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid expenses $ 1,780 $ 1,859
Other current assets 167 282
Total prepaid expenses and other $ 1,947 $ 2,141