| Cover | May 13, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 13, 2024 |
| Entity File Number | 001-40615 |
| Entity Registrant Name | QUANTUM COMPUTING INC. |
| Entity Central Index Key | 0001758009 |
| Entity Tax Identification Number | 82-4533053 |
| Entity Incorporation, State or Country Code | DE |
| 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 | 436-2161 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common shares (par value $0.0001 per share) |
| Trading Symbol | QUBT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
