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RELATED PARTY TRANSACTIONS - Additional Information (Detail) - USD ($)		9 Months Ended
	Mar. 19, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jul. 01, 2020	Oct. 02, 2019
Related Party Transaction [Line Items]
Notes payable to related party		$ 0		$ 3,573,000
Notes Payable Interest Rate At 8 With Due June 2021 [Member]
Related Party Transaction [Line Items]
Notes payable to related party				2,382,000
Notes Payable Interest Rate At 8 With Due May 2021 [Member]
Related Party Transaction [Line Items]
Notes payable to related party				1,191,000
Greenidge Blocker Corp [Member]
Related Party Transaction [Line Items]
Preferred unit, issued						15,000
Preferred unit, issuance value					$ 16,300,000	$ 15,000
Letter of Credit [Member]
Related Party Transaction [Line Items]
Net proceeds from new line of credit	$ 10,000,000
Letter of Credit [Member] \| New York State Department of Environmental Conservation [Member]
Related Party Transaction [Line Items]
Net proceeds from new line of credit		5,000,000.0
Letter of Credit [Member] \| Empire Pipeline Incorporated [Member]
Related Party Transaction [Line Items]
Repayments of lines of credit		3,600,000
Atlas [Member]
Related Party Transaction [Line Items]
Limited guaranty payment		1,000,000.0
Exposure under guarantee		$ 0
Atlas [Member] \| Notes Payable Interest Rate At 8 With Due June 2021 [Member]
Related Party Transaction [Line Items]
Notes payable to related party				2,400,000
Atlas [Member] \| Notes Payable Interest Rate At 8 With Due May 2021 [Member]
Related Party Transaction [Line Items]
Notes payable to related party				$ 1,200,000
Promissory Note Agreement [Member]
Related Party Transaction [Line Items]
Debt instrument, interest rate, stated percentage		8.00%
Interest expense			$ 500,000