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Financial Statement Components - Schedule of Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable        
Allowance for doubtful accounts $ (33) $ (12) $ (15) $ (65)
Accounts receivable, net 19,048 13,881    
Trade accounts receivable        
Accounts Receivable        
Trade accounts receivable 17,481 12,640    
Unbilled trade accounts receivable, net of advance client deposits        
Accounts Receivable        
Trade accounts receivable $ 1,600 $ 1,253