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LEASES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Dec. 31, 2018
Operating Leased Assets [Line Items]        
Operating lease right of use asset $ 1,142     $ 0
Current portion of operating lease liability 275     0
Operating lease, liability, noncurrent 954     $ 0
Total lease expense $ 138 $ 170    
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      
Maximum        
Operating Leased Assets [Line Items]        
Term of contract 4 years      
Renewal term 5 years