LEASES - Lease payments and Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Undiscounted cash payments:
Total operating lease liabilities	$ 400
Centennial, Colorado
Undiscounted cash payments:
2023	400
Total lease payments	400
Continuing operations
Undiscounted cash payments:
2020 (remainder of year)	38
2021	155
2022	158
2023	92
Total lease payments	443
Less imputed interest	(49)
Total operating lease liabilities	394	$ 479
Discontinued operations.
Undiscounted cash payments:
2020 (remainder of year)	2
2021	6
2022	4
Total lease payments	12
Less imputed interest	(2)
Total operating lease liabilities	$ 10	$ 14