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SUPPLEMENTAL CASH FLOW INFORMATION - Summary of noncash investing and financing activities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2021
Supplemental Cash Flow Information [Abstract]      
Shares issued to Support.com shareholders upon Merger (Notes 3 and 9)     $ 93,885
Stock issued to purchase miners   $ 991 991
Contribution of Preferred Units, Senior Priority Units, and Notes Payable to Related Party for Greenidge Class B common stock     72,891
Issuance of shares for investor fee associated with successful completion of Merger (Notes 4 and 9) $ 17,826   17,826
Issuance of warrants to advisor in connection with completion of Merger (Note 4 and 9) $ 8,779   $ 8,779