ORGANIZATION AND DESCRIPTION OF BUSINESS	9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	1. Organization and Description of Business Greenidge Generation Holdings Inc. (“Greenidge”) and its subsidiaries (collectively, the “Company”) owns and operates a vertically integrated bitcoin mining and power facility located in Dresden, New York. The Company’s bitcoin mining capacity generates revenue in the form of bitcoin, which are then exchanged for U.S. dollars, by earning bitcoin with application-specific integrated circuit computers (“ASICs” or “miners”) that are owned by the Company as rewards and transaction fees for supporting the global bitcoin network. Additionally, the Company generates revenues in U.S. dollars to a lesser extent from third parties for hosting and maintaining their ASICs. The Company also sells surplus electricity generated by its power plant, and not consumed in bitcoin mining operations, to the New York Independent System Operator (“NYISO”) power grid at prices set on a daily basis through the NYISO wholesale market. In addition, the Company receives revenues from the sale of its capacity and ancillary services in the NYISO wholesale market. Merger with Support, Inc. On September 14, 2021, GGH Merger Sub, Inc. (“Merger Sub”), a wholly owned subsidiary of Greenidge, merged with and into Support.com, Inc. (“Support”), with Support continuing as the surviving corporation (the “Merger”) and a wholly owned subsidiary of Greenidge, pursuant to the Agreement and Plan of Merger, dated March 19, 2021 (the “Merger Agreement”), among Greenidge, Support and Merger Sub. The Merger combined the respective businesses of Greenidge and Support through an all-stock transaction and has been accounted for using the acquisition method of accounting in accordance with the provisions of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification ("ASC") 805, Business Combinations, with Greenidge being deemed the acquiring company for accounting purposes (see Note 3). Prior to the Merger, Greenidge's class A common stock was registered pursuant to the Exchange Act and, upon completion of the Merger on September 15, 2021, began trading on Nasdaq Global Select Market under the ticker symbol “GREE”. Concurrently, Support deregistered its shares pursuant to the Exchange Act. Support provides solutions and technical programs to customers delivered by home-based employees. Support’s homesourcing model, which enables outsourced work to be delivered by people working from home, has been specifically designed for remote work, with attention to security, recruiting, training, delivery, and employee engagement. Since the consummation of the Merger, the Support business operates as a wholly owned subsidiary and segment of Greenidge.

ORGANIZATION AND DESCRIPTION OF BUSINESS

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Description of Business

1. Organization and Description of Business

Greenidge Generation Holdings Inc. (“Greenidge”) and its subsidiaries (collectively, the “Company”) owns and operates a vertically integrated bitcoin mining and power facility located in Dresden, New York. The Company’s bitcoin mining capacity generates revenue in the form of bitcoin, which are then exchanged for U.S. dollars, by earning bitcoin with application-specific integrated circuit computers (“ASICs” or “miners”) that are owned by the Company as rewards and transaction fees for supporting the global bitcoin network. Additionally, the Company generates revenues in U.S. dollars to a lesser extent from third parties for hosting and maintaining their ASICs. The Company also sells surplus electricity generated by its power plant, and not consumed in bitcoin mining operations, to the New York Independent System Operator (“NYISO”) power grid at prices set on a daily basis through the NYISO wholesale market. In addition, the Company receives revenues from the sale of its capacity and ancillary services in the NYISO wholesale market.

Merger with Support, Inc.

On September 14, 2021, GGH Merger Sub, Inc. (“Merger Sub”), a wholly owned subsidiary of Greenidge, merged with and into Support.com, Inc. (“Support”), with Support continuing as the surviving corporation (the “Merger”) and a wholly owned subsidiary of Greenidge, pursuant to the Agreement and Plan of Merger, dated March 19, 2021 (the “Merger Agreement”), among Greenidge, Support and Merger Sub.

The Merger combined the respective businesses of Greenidge and Support through an all-stock transaction and has been accounted for using the acquisition method of accounting in accordance with the provisions of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification ("ASC") 805, Business Combinations, with Greenidge being deemed the acquiring company for accounting purposes (see Note 3). Prior to the Merger, Greenidge's class A common stock was registered pursuant to the Exchange Act and, upon completion of the Merger on September 15, 2021, began trading on Nasdaq Global Select Market under the ticker symbol “GREE”. Concurrently, Support deregistered its shares pursuant to the Exchange Act.

Support provides solutions and technical programs to customers delivered by home-based employees. Support’s homesourcing model, which enables outsourced work to be delivered by people working from home, has been specifically designed for remote work, with attention to security, recruiting, training, delivery, and employee engagement. Since the consummation of the Merger, the Support business operates as a wholly owned subsidiary and segment of Greenidge.