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Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable, Net, Current [Abstract]    
Accounts receivable $ 12,500 $ 8,800
Allowance for SSDs, price protection, rights of return and other activities (3,832) (2,689)
Total accounts receivable, net $ 8,668 $ 6,111