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LEASES - Quantitative Information About Operating Leases (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating lease expense summary:        
Operating lease expense $ 103,000 $ 55,000 $ 158,000 $ 110,000
Short-term lease expense 3,000 24,000 22,000 46,000
Variable lease expense 5,000 23,000 16,000 38,000
Total $ 111,000 $ 102,000 $ 196,000 $ 194,000
Other information        
Weighted-average remaining lease term as of March 31, 2020 - operating leases 9 years 7 months 6 days   9 years 7 months 6 days  
Weighted-average discount rate as of adoption date - operating leases 5.60%   5.60%