COMMITMENTS AND CONTINGENCIES - Leases expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating lease, weighted average remaining lease term	2 years 10 months 24 days
Operating lease costs	$ 126	$ 49
Variable lease costs	66	7
Total lease costs	$ 192	$ 56
Minimum
Operating lease liability discount rates (in percent)	3.99%
Maximum
Operating lease liability discount rates (in percent)	8.95%