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LEASES - Quantitative Information About Operating Leases (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating lease expense summary:    
Operating lease expense $ 55,000 $ 55,000
Short-term lease expense 19,000 22,000
Variable lease expense 15,000 15,000
Total 89,000 $ 92,000
Other information    
Right of use assets exchanged for new operating lease liabilities as of adoption date $ 670,000  
Weighted-average remaining lease term as of March 31, 2020 - operating leases 1 year 6 months  
Weighted-average discount rate as of adoption date - operating leases 6.80%