Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES - Schedule of Future Minimum Lease Payments (Details)

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COMMITMENTS AND CONTINGENCIES - Schedule of Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Operating Lease    
2019, remainder $ 562  
2020 773  
2021 801  
2022 829  
2023 425  
Total lease payments 3,390  
Less: Present value adjustment (707)  
Operating lease liabilities $ 2,683  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019   $ 747
2020   773
2021   801
2022   829
2023   425
Total lease payments   $ 3,575