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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Accounts receivable $ 6,643 $ 8,660
Allowance for doubtful accounts (1,629) (1,827)
Accounts receivable, net $ 5,014 $ 6,833