MERGER WITH SUPPORT - Additional Information (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2021 USD ($) d $ / shares	Sep. 13, 2021 $ / shares	Dec. 31, 2020 $ / shares
Business Acquisition [Line Items]
Common stock, Par value | $ / shares	$ 0.0001	$ 0.0001		$ 0.0001
Amortization expense		$ 200,000
business acquisition proforma costs	$ 30,000,000.0	32,400,000
transaction costs after tax		$ 26,900
Common Class A [Member]
Business Acquisition [Line Items]
Common stock, Par value | $ / shares	$ 0.0001	$ 0.0001	$ 0.0001
Exchange ratio	11.500	11.500
Consideration paid	$ 93,900,000	$ 93,900,000
Greenidge Generation Holdings Inc [Member]
Business Acquisition [Line Items]
Common stock, Par value | $ / shares	$ 31.71	$ 31.71
Exchange ratio	11.500	11.500
Trading days | d		10
Consideration paid	$ 93,885,000	$ 93,885,000
Revenue	1,500,000	$ 1,500,000
transaction costs after tax	$ 24,500,000