STOCK OPTIONS - Summary of Nonvested Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Number of options
Number of Options Non-vested at beginning of period (in shares)	2,044,469
Number of Options Non-vested, Granted (in shares)	894,980	1,376,900
Number of Options Non-vested, Vested (in shares)	(952,332)
Number of Options Non-vested, Forfeited (in shares)	(184,901)
Number of Options Non-vested at end of period (in shares)	1,802,216	2,044,469
Weighted average grant date fair value
Weighted average grant date fair value, Non-vested Options at beginning of period (in dollars per share)	$ 4.61
Weighted average grant date fair value, Non-vested Options, Granted (in dollars per share)	5.76	$ 4.78
Weighted average grant date fair value, Non-vested Options, Vested (in dollars per share)	4.49
Weighted average grant date fair value, Non-vested Options, Forfeited (in dollars per share)	5.21
Weighted average grant date fair value, Non-vested Options at end of period (in dollars per share)	$ 5.21	$ 4.61