STOCK BASED COMPENSATION - Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stock-based compensation
Options granted (in shares)			767,913
Stock-based compensation expense	$ 2,231	$ 2,702	$ 4,308	$ 5,683
Unrecognized stock-based compensation balance for unvested options	11,500	21,400	$ 11,500	$ 21,400
Weighted-average fair value of options granted (in dollars per share)			$ 1.79	$ 10.86
Options
Stock-based compensation
Stock-based compensation expense	$ 1,800	$ 2,300	$ 3,800	$ 4,800
Weighted Average Remaining Recognition Period (in years)			2 years 6 months	2 years 7 months 6 days