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BUSINESS COMBINATION (Details)
12 Months Ended
Jun. 10, 2021
USD ($)
$ / shares
shares
Jun. 09, 2021
shares
Dec. 31, 2021
USD ($)
Vote
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Feb. 15, 2022
Feb. 18, 2021
USD ($)
Business Combination [Abstract]              
Increase in cash $ 540,276,000            
Warrant liabilities 11,618,000   $ 7,239,000 $ 0      
Stock-based compensation expense     24,918,000 $ 1,924,000 $ 2,715,000    
Net equity infusion from the Business Combination     $ 501,170,000        
PIPE Investors [Member]              
Business Combination [Abstract]              
Increase in cash 425,001,000            
Sponsor [Member] | Subsequent Event [Member]              
Business Combination [Abstract]              
Percentage of combined voting power held by Sponsor           80.10%  
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
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        
Stock-based compensation expense     463,000        
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