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ACCOUNTS RECEIVABLE, NET - Schedule of Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Contract billings $ 2,907 $ 3,751
Retainage 291 274
Subtotal 3,198 4,025
Less – allowance for doubtful accounts (70) (185)
Accounts receivable, net $ 3,128 $ 3,840