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LEASES - Schedule of Lease Cost (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating leases $ 78,000 $ 99,000 $ 262,000 $ 309,000
Short-term leases 74,000 96,000 223,000 222,000
Sublease income 0 (9,000) 0 (65,000)
Total lease expense $ 152,000 $ 186,000 $ 485,000 $ 466,000
Weighted average remaining lease term of operating leases 2 years 8 months 12 days 3 years 6 months 2 years 8 months 12 days 3 years 6 months
Weighted average discount rate of operating leases 9.00% 9.00% 9.00% 9.00%
Cash paid for amounts included in the measurement of operating lease liabilities $ 85,000 $ 105,000 $ 282 $ 243,000