CAPITAL STOCK, STOCK-BASED COMPENSATION AND BENEFIT PLAN - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Stock Options
Outstanding beginning balance (in shares)	11,775,411
Granted (in shares)	4,143,813
Expired (in shares)	(5,989)
Canceled and forfeited (in shares)	(1,299,122)
Outstanding ending balance (in shares)	14,614,113	11,775,411
Options exercisable at end of period (in shares)	8,215,979
Weighted Average Exercise Price
Outstanding beginning balance (in dollars per share)	$ 5.82
Granted (in dollars per share)	0.83
Expired (in dollars per share)	5.82
Canceled and forfeited (in dollars per share)	7.43
Outstanding ending balance (in dollars per share)	4.40	$ 5.82
Options exercisable at end of period, weighted-average exercise price (in dollars per share)	$ 6.52
Weighted-Average Remaining Contractual Life (years)
Options outstanding, weighted-average remaining contractual life (in years)	7 years 2 months 1 day	7 years 3 months 3 days
Options exercisable at end of period, weighted-average remaining contractual life (in years)	5 years 9 months 18 days
Options outstanding, aggregate intrinsic value	$ 2,345