COMMITMENTS AND CONTINGENCIES - Operating Leases Rent expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating lease, weighted average remaining lease term	2 years 2 months 12 days		2 years 2 months 12 days
Operating lease costs	$ 57	$ 42	$ 109	$ 81
Variable lease costs	14	17	29	41
Total lease costs	$ 71	$ 59	$ 138	$ 122
Minimum
Lessee, Operating Lease, Discount Rate	3.99%		3.99%
Maximum
Lessee, Operating Lease, Discount Rate	8.95%		8.95%