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Accounts Receivable, Net and Revenue Concentrations - Accounts Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts Receivable, Net, Current [Abstract]        
Trade receivables, gross $ 124,399 $ 120,965    
Allowance for doubtful accounts (945) (904) $ (799) $ (822)
Allowance for sales returns (501) (539)    
Net trade receivables 122,953 119,522    
Other 6,278 5,070    
Accounts receivable, net $ 129,231 $ 124,592