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ACCOUNTS RECEIVABLE, NET - Schedule of Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Contract billings $ 2,794 $ 3,136
Fees receivable 6 13
Retainage 0 308
Subtotal 2,800 3,457
Less – allowance for doubtful accounts (301) (156)
Accounts receivable, net $ 2,499 $ 3,301