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LEASES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Operating Leased Assets [Line Items]            
Operating lease right of use asset $ 1,063   $ 1,063     $ 0
Current portion of operating lease liability 308   308     0
Operating lease, liability, noncurrent 904   904     $ 0
Total lease expense $ 142 $ 170 $ 280 $ 340    
Accounting Standards Update 2016-02            
Operating Leased Assets [Line Items]            
Operating lease right of use asset         $ 1,140  
Current portion of operating lease liability         270  
Operating lease, liability, noncurrent         $ 960  
Minimum            
Operating Leased Assets [Line Items]            
Term of contract 1 year   1 year      
Maximum            
Operating Leased Assets [Line Items]            
Term of contract 4 years   4 years      
Renewal term 5 years   5 years