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LEASES - Maturities of Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Operating    
2019 (remaining 3 months) $ 28  
2020 113  
2021 117  
2022 114  
2023 0  
Total 372 $ 221
Less imputed interest (23)  
Present value of lease liabilities 349  
Less current portion of lease liabilities (101)  
Long-term portion of lease liabilities 248  
Finance Lease, Liability, Payment, Due [Abstract]    
2019 (remaining 3 months) 55  
2020 220  
2021 220  
2022 170  
2023 18  
Total lease payments 683  
Less imputed interest (43)  
Present value of lease liabilities 640  
Less current portion of lease liabilities (196)  
Long-term portion of lease liabilities $ 444