v3.25.2
Document and Entity Information
Aug. 08, 2025
Entity Listings [Line Items]  
Document Type 8-K
Document Period End Date Aug. 08, 2025
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
Entity Emerging Growth Company false
Entity Central Index Key 0001816431
Amendment Flag false
Common Class A  
Entity Listings [Line Items]  
Title of 12(b) Security Class A common stock, par value $0.0001 per share
Trading Symbol QSI
Security Exchange Name 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  
Entity Listings [Line Items]  
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share
Trading Symbol QSIAW
Security Exchange Name NASDAQ