STOCKHOLDERS’ DEFICIT - Narrative (Details)										3 Months Ended	6 Months Ended	12 Months Ended		24 Months Ended	30 Months Ended
	Sep. 24, 2024 shares	Jul. 30, 2024 USD ($)	Feb. 12, 2024 USD ($) $ / shares shares	Feb. 09, 2024 shares	Jan. 30, 2024 shares	Dec. 11, 2023 USD ($) $ / shares shares	Apr. 11, 2023 $ / shares	Oct. 03, 2022 USD ($)	Apr. 28, 2022 shares	Dec. 31, 2024 USD ($) vote $ / shares shares	Mar. 25, 2025 USD ($) shares	Dec. 31, 2024 USD ($) vote $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Apr. 28, 2024 USD ($) shares	Mar. 21, 2025 USD ($) shares	Mar. 28, 2025 USD ($)	Aug. 14, 2024 $ / shares shares	Apr. 07, 2022 USD ($)
Class of Stock [Line Items]
Greenidge common stock value per share (in dollars per share) | $ / shares										$ 0.0001		$ 0.0001	$ 0.0001
Common stock, outstanding (in shares)										13,025,627		13,025,627	9,131,252
Common stock, issued (in shares)										13,025,627		13,025,627	9,131,252
Warrants outstanding (in shares)										1,260,505		1,260,505	180,000
Exercise price (in dollars per share) | $ / shares						$ 7.00				$ 5.25		$ 5.25	$ 7.00
Warrant term (in years)						1 year				1 year		1 year
Number of securities called by warrants (in shares)						180,000
Warrant issued in exchange for warrant asset | $												$ 4,866,000	$ 477,000
Shares issued in connection with equity exchange agreement (in shares)						180,000
Share price (in dollars per share) | $ / shares						$ 4.83
Shares issues in connection with equity exchange agreement | $						$ 900,000						0	869,000
Warrant asset | $													477,000
Impairment of equity securities | $												869,000	0
Change in fair value of warrant asset | $												(477,000)	0
Issuance of shares for amendment fee associated with debt modification | $										$ 1,620,000			1,000,000
Senior Unsecured Notes | Senior Notes
Class of Stock [Line Items]
Debt exchanged | $										$ 3,660,000		$ 3,660,000
Infinite Reality, Inc
Class of Stock [Line Items]
Exercise price (in dollars per share) | $ / shares						$ 5.35
Warrant term (in years)						1 year
Number of securities called by warrants (in shares)						235,754
Shares issued in connection with equity exchange agreement (in shares)						280,374
Warrant asset | $													$ 500,000
February 2024 Pre-Funded Warrant
Class of Stock [Line Items]
Warrants outstanding (in shares)			810,205
Warrant issued in exchange for warrant asset | $			$ 2,000,000
Common Stock Warrant
Class of Stock [Line Items]
Warrant issued in exchange for warrant asset | $			$ 2,800,000
Subsequent Event | Senior Unsecured Notes | Senior Notes
Class of Stock [Line Items]
Debt exchanged | $																$ 1,800,000
Common Stock Purchase Agreement
Class of Stock [Line Items]
Maximum aggregate consideration to be received on transaction | $		$ 20,000,000
Sale of stock, period (in months)		36 months
Number of shares issued in transaction (in shares)	7,300,000											1,595,855
Net proceeds received | $												$ 4,300,000
Common Stock Purchase Agreement | Subsequent Event
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)											1,595,855
Net proceeds received | $											$ 4,300,000
Securities Purchase Agreement
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)			450,300
Net proceeds received | $			$ 6,000,000.0
Sale of stock (in dollars per share) | $ / shares			$ 4.76
Exercise price (in dollars per share) | $ / shares			$ 0.0001														$ 5.25
Warrant term (in years)			5 years
Number of securities called by warrants (in shares)																	1,260,505
At The Market Issuance Sales Agreement
Class of Stock [Line Items]
Maximum aggregate consideration to be received on transaction | $								$ 22,800,000
Number of shares issued in transaction (in shares)												0	3,879,309
Net proceeds received | $												$ 0	$ 18,700,000
Underwriter compensation, percentage of gross stock sales (as percent)								3.00%
At The Market Issuance Sales Agreement | Subsequent Event
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)															4,167,463
Net proceeds received | $															$ 20,700,000
Equity Purchase Agreement
Class of Stock [Line Items]
Maximum aggregate consideration to be received on transaction | $																		$ 500,000,000
Sale of stock, period (in months)									24 months
Number of shares issued in transaction (in shares)									572,095			45,269		549,285
Net proceeds received | $												$ 1,000,000		$ 8,000,000
Exchange Agreement
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)										692,433
Class A Common Stock, $0.0001 par value
Class of Stock [Line Items]
Greenidge common stock value per share (in dollars per share) | $ / shares							$ 0.0001
Conversion ratio							0.1
Number of votes | vote										1		1
Common stock, outstanding (in shares)										10,292,233		10,292,233
Common stock, issued (in shares)										10,292,233		10,292,233
Number of shares issued in conversion (in shares)				42,000	77,245
Common Class B
Class of Stock [Line Items]
Greenidge common stock value per share (in dollars per share) | $ / shares							$ 0.0001
Conversion ratio							0.1
Number of votes | vote										10		10
Common stock, outstanding (in shares)										2,733,394		2,733,394
Common stock, issued (in shares)										2,733,394		2,733,394
Common stock, convertible, conversion ratio										1		1
Number of shares converted (in shares)				42,000	77,245