v3.26.1
Cover - shares
6 Months Ended
Jun. 30, 2026
Aug. 07, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-40615  
Registrant Name QUANTUM COMPUTING INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 82-4533053  
Entity Address, Address Line One 5 Marine View Plaza  
Entity Address, Address Line Two Suite 214  
Entity Address, City or Town Hoboken  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 07030  
City Area Code 703  
Local Phone Number 436-2121  
Title of 12(b) Security Common Stock, par value $.0001  
Trading Symbol QUBT  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   226,346,861
Entity Central Index Key 0001758009  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Amendment Flag false