SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Loss (income) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income (loss) attributable to common shareholders
Net income (loss)	$ (9,890)	$ (13,143)	$ (11,044)	$ (14,077)
Net income (loss) attributable to common shareholders	$ (9,890)	$ (13,143)	$ (11,044)	$ (14,077)
Weighted-average common shares outstanding:
Weighted-average common shares outstanding: basic	73,195,076	63,013,291	73,194,626	62,172,031
Weighted-average common shares outstanding: diluted	73,195,076	63,013,291	73,194,626	62,172,031
Income (loss) per common share – Basic and diluted
Net income (loss) per common share - basic (in usd per share)	$ (0.14)	$ (0.21)	$ (0.15)	$ (0.23)
Net income (loss) per common share - diluted (in usd per share)	$ (0.14)	$ (0.21)	$ (0.15)	$ (0.23)