STOCKHOLDERS' EQUITY - Additional Information (Detail)			1 Months Ended			3 Months Ended		9 Months Ended
	Sep. 15, 2021 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) shares	Jul. 31, 2020 USD ($)	Oct. 31, 2018 shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Sep. 13, 2021 $ / shares shares	Jan. 01, 2021 $ / shares
Class of Stock [Line Items]
Common stock, shares authorized		0				3,000,000,000		3,000,000,000
Common stock, Par or stated value per share | $ / shares		$ 0.0001				$ 0.0001		$ 0.0001
Common stock | $		$ 0				$ 4,000		$ 4,000
Preferred stock, shares authorized		0				20,000,000		20,000,000
Preferred stock, par or stated value per share | $ / shares		$ 0.0001				$ 0.0001		$ 0.0001
Preferred stock, Shares outstanding		0				0		0
Payment of stock issuance costs | $								$ 2,296,000	$ 0
Shares issued, Price per share | $ / shares						$ 31.71		$ 31.71
Common stock, shares issued		0				38,667,705		38,667,705
Common Stock, Shares, Outstanding		0				38,667,705		38,667,705
Share-based Payment Arrangement, Expense | $						$ 400,000	$ 0	$ 1,500,000	$ 0
Common units, issued		750
Common units, outstanding		750
Maximum [Member]
Class of Stock [Line Items]
Maximum class A common stock and class B common stock shares in excess of the exchange cap	19.99%
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
Greenidge Generation Holdings Inc [Member]
Class of Stock [Line Items]
Number of tranche | $				2
Greenidge Generation Holdings Inc [Member] | Preferred Stock
Class of Stock [Line Items]
Preferred units, voting rights								one vote per preferred unit
Greenidge Generation Holdings Inc [Member] | Tranche One
Class of Stock [Line Items]
Partners' Capital Account, Exchanges and Conversions | $				$ 13,900,000
Greenidge Generation Holdings Inc [Member] | Tranche Two
Class of Stock [Line Items]
Partners' Capital Account, Exchanges and Conversions | $				$ 16,300,000
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		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 | $			$ 37,100,000
Private Placement | Greenidge Generation Holdings Inc [Member] | Common Stock Purchase Agreement and Registration Rights Agreement [Member]
Class of Stock [Line Items]
Proceeds from common stock purchase agreement | $	$ 200,000,000
Private Placement | Greenidge Generation Holdings Inc [Member] | Common Stock Purchase Agreement and Registration Rights Agreement [Member] | Maximum [Member]
Class of Stock [Line Items]
Discount rate	6.00%
Private Placement | Greenidge Generation Holdings Inc [Member] | Common Stock Purchase Agreement and Registration Rights Agreement [Member] | Minimum [Member]
Class of Stock [Line Items]
Discount rate	5.00%
Common Class A [Member]
Class of Stock [Line Items]
Stock owned								16.60%
Common stock, shares authorized										2,400,000,000
Fair Value Of warrant | $								$ 8,800,000
Common stock, Par or stated value per share | $ / shares						$ 0.0001		$ 0.0001		$ 0.0001
Warrant To Purchase								344,800
Additional Common Stock Shares Issued								562,174
Additional Common Stock Value Issued | $						$ 17,800,000		$ 17,800,000
Common stock, shares issued						9,627,705		9,627,705
Exercise Price | $ / shares						$ 6.25		$ 6.25
Common Stock, Shares, Outstanding						9,627,705		9,627,705
Stock issued during period shares, Conversion of convertible securities								5,760,000
Common Class A [Member] | Minimum [Member]
Class of Stock [Line Items]
Investors obligation to purchase own issued and outstanding shares	4.99%
Common Class A [Member] | Common Stock Purchase Agreement and Registration Rights Agreement [Member]
Class of Stock [Line Items]
Proceeds from common stock purchase agreement | $	$ 500,000
Proceeds from issuance of private placement | $	$ 500,000,000
Common Class A [Member] | Merger Agreement [Member]
Class of Stock [Line Items]
Common stock | $						$ 93,900,000		$ 93,900,000
Payment of stock issuance costs | $								$ 91,600,000
Common stock, shares issued						2,960,731		2,960,731
Common Class B [Member]
Class of Stock [Line Items]
Common stock, shares authorized										600,000,000
Common stock, Par or stated value per share | $ / shares										$ 0.0001
Common stock, shares issued						29,040,000		29,040,000
Common Stock, Shares, Outstanding						29,040,000		29,040,000
Stock issued during period shares, Conversion of convertible securities								720,000
Common Class B [Member] | 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 A Common Stock | Common Stock
Class of Stock [Line Items]
Common Stock, voting rights								one vote per share
GGHI Class B Common Stock
Class of Stock [Line Items]
Shares issued in exchange for acquisition of ownership interests			28,000,000
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