STOCK OPTIONS - Summary of Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Number of options
Outstanding, beginning of period (in shares)	4,938,943	3,966,858
Granted (in shares)	894,980	1,376,900
Exercised (in shares)	(232,521)	(112,965)
Cancelled and forfeited (in shares)	(203,711)	(291,850)
Outstanding, end of period (in shares)	5,397,691	4,938,943
Weighted average exercise price
Outstanding, beginning of period (in dollars per share)	$ 5.46	$ 4.67
Granted (in dollars per share)	9.37	7.94
Exercised (in dollars per share)	6.65	3.37
Cancelled and forfeited (in dollars per share)	8.27	7.19
Outstanding, end of period (in dollars per share)	$ 5.95	$ 5.46