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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Accounts receivable $ 5,857 $ 8,697
Allowance for doubtful accounts (1,769) (1,845)
Accounts receivable, net $ 4,088 $ 6,852