Registration of securities issued in business combination transactions

COMMITMENTS AND CONTINGENCIES (Details)

v3.21.2
COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
 1 Months Ended
Dec. 31, 2020
Sep. 30, 2021
Jul. 15, 2021
Feb. 09, 2021
Fathom Inc [Member]        
Commitments And Contingencies [Line Items]        
Business combination proforma equity value     $ 1,500,000,000  
Souce of funding the business combination private investment in common stock     $ 80,000,000  
Investment owned value per share     $ 10.00  
Underwriting Agreement        
Commitments And Contingencies [Line Items]        
Underwriting discount per share $ 0.20      
Over-allotment        
Commitments And Contingencies [Line Items]        
Deferred underwriting fee per unit (in dollars per share) $ 0.35 $ 0.35    
Deferred underwriting fees $ 12,075,000 $ 12,075,000    
Over-allotment | Underwriting Agreement        
Commitments And Contingencies [Line Items]        
Period granted to subscribe for the shares 45 days      
Common stock shares subscribed but not issued 4,500,000      
IPO        
Commitments And Contingencies [Line Items]        
Deferred underwriting fees $ 10,500,000     $ 12,075,000
IPO | Underwriting Agreement        
Commitments And Contingencies [Line Items]        
Cash underwriting discount payable 6,000,000      
IPO Including Overallotment | Underwriting Agreement        
Commitments And Contingencies [Line Items]        
Cash underwriting discount payable $ 6,900,000