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BUSINESS COMBINATION (Details)
9 Months Ended
Jun. 10, 2021
USD ($)
$ / shares
shares
Jun. 09, 2021
shares
Sep. 30, 2021
USD ($)
Vote
Feb. 18, 2021
USD ($)
Dec. 31, 2020
USD ($)
Business Combination [Abstract]          
Increase in cash $ 540,276,000        
Warrant liabilities 11,618,000   $ 8,176,000   $ 0
PIPE Investors [Member]          
Business Combination [Abstract]          
Increase in cash $ 425,001,000        
Class A Common Stock [Member]          
Business Combination [Abstract]          
Exchange Ratio     0.7975    
Class B Common Stock [Member]          
Business Combination [Abstract]          
Exchange Ratio     0.7975    
HighCape [Member]          
Business Combination [Abstract]          
Exchange Ratio       0.7975  
Base amount included in numerator of Exchange Ratio calculation       $ 810,000,000  
Expense threshold included in numerator of Exchange Ratio calculation       8,025,000  
Denominator included in Exchange Ratio calculation       $ 10.00  
Percentage of combined voting power held by Sponsor 80.40%        
Increase in cash $ 115,275,000        
Transaction costs 17,824,000        
Payment of PPP loan, including interest 1,764,000        
Payments to redeeming shareholders 5,712,000        
Payment to third party service provider 3,800,000        
Proceeds on date of Business Combination, excluding warrant liabilities and other insignificant assets and liabilities 511,176,000        
Warrant liabilities 11,618,000        
Transaction costs expensed     $ 7,383,000    
Other liabilities and related transaction costs $ 21,776,000        
Net equity infusion from the Business Combination     $ 501,170,000    
HighCape [Member] | Foresite Funds [Member]          
Business Combination [Abstract]          
Shares outstanding (in shares) | shares   696,250      
HighCape [Member] | Initial Stockholders [Member]          
Business Combination [Abstract]          
Shares outstanding (in shares) | shares   2,178,750      
HighCape [Member] | Class A Common Stock [Member]          
Business Combination [Abstract]          
Votes per share | Vote     1    
Shares outstanding (in shares) | shares 116,463,160        
HighCape [Member] | Class A Common Stock [Member] | Legacy Quantum-Si Stockholders [Member]          
Business Combination [Abstract]          
Shares outstanding (in shares) | shares 59,754,288        
HighCape [Member] | Class A Common Stock [Member] | PIPE Investors [Member]          
Business Combination [Abstract]          
Shares issued (in shares) | shares 42,500,000        
Share price (in dollars per share) | $ / shares $ 10.00        
Shares outstanding (in shares) | shares 42,500,000        
HighCape [Member] | Class A Common Stock [Member] | Foresite Funds [Member]          
Business Combination [Abstract]          
Shares issued (in shares) | shares 696,250        
Share price (in dollars per share) | $ / shares $ 0.001        
Aggregate gross proceeds $ 1,000        
Shares outstanding (in shares) | shares 696,250        
HighCape [Member] | Class A Common Stock [Member] | Initial Stockholders [Member]          
Business Combination [Abstract]          
Shares outstanding (in shares) | shares 2,178,750        
HighCape [Member] | Class A Common Stock [Member] | Sponsor [Member]          
Business Combination [Abstract]          
Shares outstanding (in shares) | shares 405,000        
HighCape [Member] | Class A Common Stock [Member] | Public Stockholders [Member]          
Business Combination [Abstract]          
Shares outstanding (in shares) | shares 10,928,872        
Shares redeemed (in shares) | shares 571,128        
HighCape [Member] | Class B Common Stock [Member]          
Business Combination [Abstract]          
Votes per share | Vote     20    
Shares outstanding (in shares) | shares 19,937,500        
HighCape [Member] | Class B Common Stock [Member] | Minimum [Member]          
Business Combination [Abstract]          
Percentage of total shares that must be beneficially owned included in sunset provision     20.00%    
HighCape [Member] | Class B Common Stock [Member] | Sponsor [Member]          
Business Combination [Abstract]          
Shares forfeited (in shares) | shares   696,250