COMMITMENTS AND CONTINGENCIES - Operating Leases Rent expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating lease, weighted average remaining lease term	2 years 2 months 12 days
Operating lease costs	$ 52	$ 44
Variable lease costs	15	13
Total lease costs	$ 67	$ 57
Minimum
Lessee, Operating Lease, Discount Rate	4.02%
Maximum
Lessee, Operating Lease, Discount Rate	8.95%