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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Accounts receivable $ 8,442 $ 6,835
Allowance for doubtful accounts (2,497) (2,472)
Accounts receivable, net $ 5,945 $ 4,363