MERGER WITH SUPPORT - Summary of Supplemental Pro Forma Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Net (loss) income	$ (44,480)	$ (3,290)
Greenidge Generation Holdings Inc [Member]
Business Acquisition [Line Items]
Revenues	132,114	63,978
Net (loss) income	$ (50,474)	$ (3,517)