NET LOSS PER SHARE - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net loss to common stockholders, basic	$ (16,618)	$ (31,597)	$ (61,448)	$ (52,894)
Denominator:
Net loss to common stockholders, diluted	$ (16,618)	$ (31,597)	$ (61,448)	$ (52,894)
Weighted-average shares outstanding – basic (in shares)	157,076,260	152,861,300	155,377,648	152,427,346
Weighted-average shares outstanding – diluted (in shares)	157,076,260	152,861,300	155,377,648	152,427,346
Net loss per share - basic (in USD per share)	$ (0.11)	$ (0.21)	$ (0.40)	$ (0.35)
Net loss per share - diluted (in USD per share)	$ (0.11)	$ (0.21)	$ (0.40)	$ (0.35)