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STOCK-BASED COMPENSATION - 2015 EIP Restricted Stock (Details) - 2015 EIP Plan - Restricted Stock - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock Awards        
Vesting period of awards     3 years  
Number of Shares        
Balance at the beginning of the period (in shares)     6,802  
Vested (in shares)     0 0
Balance at the end of the period (in shares) 6,802   6,802  
Weighted Average Fair Value        
Balance at the beginning of the period (in dollars per share)     $ 5.20  
Balance at the end of the period (in dollars per share) $ 5.20   $ 5.20  
Unrecognized compensation cost related to nonvested stock awards        
Unrecognized compensation cost $ 5   $ 5  
Weighted-average period for recognition of unrecognized compensation cost     4 months 17 days  
General and Administrative Expense        
Additional disclosures        
Recognized nonvested stock amortization expense $ 3 $ 8 $ 6 $ 16