0001816431 2023-02-28 2023-02-28 0001816431 qsi:RedeemableWarrantsEachWholeWarrantExercisableForOneShareOfClassACommonStockEachAtAnExercisePriceOf1150PerShareMember 2023-02-28 2023-02-28 0001816431 us-gaap:CommonClassAMember 2023-02-28 2023-02-28 false 0001816431 8-K 2023-02-28 QUANTUM-SI INCORPORATED DE 001-39486 85-1388175 530 Old Whitfield Street Guilford CT 06437 866 688-7374 false false false false Class A common stock, par value $0.0001 per share QSI NASDAQ Redeemable warrants, each whole warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share QSIAW NASDAQ false