STOCKHOLDERS' EQUITY - Additional Information (Detail)		1 Months Ended		3 Months Ended	6 Months Ended
	Dec. 31, 2020 $ / shares shares	Jan. 31, 2021 USD ($) shares	Oct. 31, 2018 shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)
Class of Stock [Line Items]
Capital units, authorized					520,000,000
Common stock, shares authorized	0				500,000,000
Common stock, par or stated value per share | $ / shares	$ 0.0001				$ 0.0001
Preferred stock, shares authorized	0				20,000,000
Preferred stock, par or stated value per share | $ / shares	$ 0.0001				$ 0.0001
Shares issued in exchange for acquisition of ownership interests					7,000,000
Common stock, shares issued	0				28,320,000
Common Stock, Shares, Outstanding	0				28,320,000
Share-based Payment Arrangement, Expense | $				$ 0		$ 0
Common units, issued	750
Common units, outstanding	750
Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized					20,000,000
Preferred stock, par or stated value per share | $ / shares					$ 0.0001
Dividends, preferred stock, paid-in-kind percentage					12.00%
Common shares initial conversion price | $ / shares					$ 25
Preferred Stock, liquidation preference per share | $ / shares					$ 25
Tranche One
Class of Stock [Line Items]
Number of tranche | $					13,926
Tranche Two
Class of Stock [Line Items]
Number of tranche | $					16,276
Resticted Common Stock Unit
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					616,920
Shares based payment arrangement, equity instrument other than option, non vested units					616,920
Equity Incentive Plan
Class of Stock [Line Items]
Shares based payment arrangement, shares purchased for award			1,250
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			750
Shares based payment arrangement, equity instrument other than option, vested in period	730
Shares based payment arrangement, equity instrument other than option, non vested units	20
Shares based payment arrangement, vesting rights percentage					100.00%
Greenidge Common Stock
Class of Stock [Line Items]
Stock Issued During Period, Shares, Stock Splits		28,000,000
Stockholders equity note stock split		4-for-1
Private Placement
Class of Stock [Line Items]
Proceeds from issuance of private placement | $		$ 37,112,000
Common Class A
Class of Stock [Line Items]
Common stock, shares authorized					400,000,000
Common stock, par or stated value per share | $ / shares					$ 0.0001
Common stock, shares issued					0
Common Stock, Shares, Outstanding					0
Common Class A | Common Stock
Class of Stock [Line Items]
Common Stock, voting rights					one vote per share
Common Class B
Class of Stock [Line Items]
Common stock, shares authorized					100,000,000
Common stock, par or stated value per share | $ / shares					$ 0.0001
Common stock, shares issued					28,320,000
Common Stock, Shares, Outstanding					28,320,000
Common Class B | Common Stock
Class of Stock [Line Items]
Common Stock, voting rights					ten votes per share
Series A Redeemable Convertible Preferred Stock | Private Placement
Class of Stock [Line Items]
Stock issued during period, Shares		1,620,000
Shares issued, Price per share | $ / shares					$ 25
GGHI Class B Common Stock
Class of Stock [Line Items]
Stock Issued During Period, Shares, Stock Splits		28,000,000
Stockholders equity note stock split		4-for-1
GGHI Class B Common Stock | Greenidge Common Stock
Class of Stock [Line Items]
Shares issued in exchange for acquisition of ownership interests		7,000,000
GGHI Class B Common Stock | Private Placement
Class of Stock [Line Items]
Conversion of Stock, Shares Converted		750