v3.26.1
Cover - shares
 3 Months Ended
Mar. 31, 2026
May 08, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Information [Line Items]    
Entity Registrant Name QUANTUM COMPUTING INC.  
Entity Central Index Key 0001758009  
Entity File Number 001-40615  
Entity Tax Identification Number 82-4533053  
Entity Incorporation, State or Country Code DE  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Incorporation, Date of Incorporation Jul. 20, 2018  
Entity Contact Personnel [Line Items]    
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  
Entity Phone Fax Numbers [Line Items]    
City Area Code (703)  
Local Phone Number 436-2121  
Entity Listings [Line Items]    
Title of 12(b) Security Common Stock, par value $.0001  
Trading Symbol QUBT  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   225,534,987