v3.26.1
Document and Entity Information
Jun. 18, 2026
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jun. 18, 2026
Entity Registrant Name QUANTUM-SI INCORPORATED
Entity Incorporation, State or Country Code DE
Entity File Number 001-39486
Entity Tax Identification Number 85-1388175
Entity Address, Address Line One 29 Business Park Drive
Entity Address, City or Town Branford
Entity Address, State or Province CT
Entity Address, Postal Zip Code 06405
City Area Code 866
Local Phone Number 688-7374
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Class A common stock, par value $0.0001 per share
Trading Symbol QSI
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001816431
Amendment Flag false