COMMITMENTS AND CONTINGENCIES - Operating Leases Rent expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating lease, weighted average remaining lease term	1 year 10 months 25 days		1 year 10 months 25 days
Operating lease costs	$ 57	$ 57	$ 166	$ 138
Variable lease costs	15	3	44	44
Total lease costs	$ 72	$ 60	$ 210	$ 182
Minimum
Operating lease liability (in percent)	3.99%		3.99%
Maximum
Operating lease liability (in percent)	8.95%		8.95%