STOCK BASED COMPENSATION - RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Stock-based compensation
Stock-based compensation expense	$ 9,162	$ 11,177
Restricted Stock Units (RSUs)
Stock-based compensation
Stock-based compensation expense	1,300	$ 1,900
Unamortized stock-based compensation costs for unvested awards	$ 3,500
Summary of restricted stock units outstanding
Outstanding at beginning of period ( in shares)	469,485
Awarded (in shares)	605,600
Released (in shares)	(50,242)
Forfeited (in shares)	(209,334)
Outstanding at end of period ( in shares)	815,509	469,485
Nonvested at end of period (in shares)	815,509
Weighted-Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 18.05
Awarded (in dollars per share)	2.33
Released (in dollars per share)	24.57
Forfeited (in dollars per share)	18.10
Outstanding at end of period (in dollars per share)	5.96	$ 18.05
Nonvested at end of period (in dollars per share)	$ 5.73
Aggregate Intrinsic Value
Outstanding at end of period (in dollars)	$ 620	$ 4,202
Nonvested at end of period (in dollars)	$ 582
Weighted Average Remaining Recognition Period (in years)	3 years 2 months 12 days