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Organization and Description of Business	3 Months Ended
Organization and Description of Business	Mar. 31, 2024
Organization and Description of Business [Abstract]
Organization and Description of Business	Note 1. Organization and Description of Business Quantum-Si Incorporated (including its subsidiaries, the “Company” or “Quantum-Si”) was incorporated in Delaware on June 10, 2020 as HighCape Capital Acquisition Corp. The Company’s legal name became Quantum-Si Incorporated following a business combination on June 10, 2021 between the Company and Q-SI Operations Inc. (formerly Quantum-Si Incorporated), which was founded in 2013. The Company is an innovative life sciences company with the mission of transforming single-molecule analysis and democratizing its use by providing researchers and clinicians access to the proteome, the set of proteins expressed within a cell. The Company has developed a proprietary universal single-molecule detection platform that the Company is first applying to proteomics to enable Next-Generation Protein Sequencing^TM(“NGPS”), the ability to sequence proteins in a massively parallel fashion (rather than sequentially, one at a time), and can be used for the study of nucleic acids. The Company’s platform is currently comprised of the Platinum^® NGPS instrument, the Platinum Analysis Software service, reagent kits and semiconductor chips for use with its instruments.