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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 9 Months Ended
Sep. 30, 2021
Supplemental Cash Flow Elements [Abstract]  
Summary of noncash investing and financing activities
Greenidge had the following noncash investing and financing activities during the nine months ended September 30, 2021:
 
$ in thousands
  
 
 
Shares issued to Support.com shareholders upon Merger (Notes 3 and 9)
  
$
93,885
 
Stock issued to purchase miners
  
$
991
 
Contribution of Preferred Units, Senior Priority Units, and notes payable to related party for Greenidge class B common stock (Note 9)
  
$
72,891
 
Issuance of shares for investor fee associated with successful completion of Merger (Notes 4 and 9)
  
$
17,826
 
Issuance of warrants to advisor in connection with completion of Merger (Note 4 and 9)
  
$
8,779