| Document and Entity Information | Sep. 15, 2021 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | Sep. 15, 2021 |
| Entity Registrant Name | Greenidge Generation Holdings Inc. |
| Entity File Number | 001-40808 |
| Entity Incorporation State Country Code | DE |
| Entity Tax Identification Number | 86-1746728 |
| Entity Address, Address Line One | 135 Rennell Drive |
| Entity Address, Address Line Two | 3rd Floor |
| Entity Address, City or Town | Fairfield |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06890 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Description | As previously disclosed in the Current Report on Form 8-K of Greenidge Generation Holdings Inc., a Delaware corporation (the “Company”), filed with the U.S. Securities and Exchange Commission on September 15, 2021 (the “Original Form 8-K”), GGH Merger Sub, Inc., a Delaware corporation (“Merger Sub”) and a wholly owned subsidiary of the Company, merged with and into Support.com, Inc., a Delaware corporation (“Support.com”), with Support.com continuing as the surviving corporation (the “Merger”) and a wholly owned subsidiary of the Company, pursuant to the previously announced Agreement and Plan of Merger, dated March 19, 2021 (the “Merger Agreement”), among the Company, Support.com and Merger Sub.At the effective time of the Merger, the Company issued 2,960,731 shares of class A common stock in exchange for all shares of common stock, par value $0.0001, of Support.com and all outstanding stock options and restricted stock units of Support.com.This Amendment to Form 8-K amends and supplements the Original Form 8-K to include certain pro forma financial statements relating to the Merger required by Item 9.01 of Form 8-K. This Amendment to Form 8-K should be read in connection with the previously filed Current Report on Form 8-K described above which provides a more complete description of the Merger. |
| Entity Central Index Key | 0001844971 |
| City Area Code | 315 |
| Local Phone Number | 536-2359 |
| 8.50% Senior Notes due 2026 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 8.50% Senior Notes due 2026 |
| Trading Symbol | GREEL |
| Security Exchange Name | NASDAQ |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A Common Stock, $0.0001 par value |
| Trading Symbol | GREE |
| Security Exchange Name | NASDAQ |
