| Document And Entity Information - USD ($) | 12 Months Ended | ||
| Dec. 31, 2022 | Mar. 28, 2023 | Jun. 30, 2022 | |
| Document Information Line Items | |||
| Entity Registrant Name | Quantum Computing Inc. | ||
| Trading Symbol | QUBT | ||
| Document Type | 10-K/A | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Common Stock, Shares Outstanding | 60,496,062 | ||
| Entity Public Float | $ 59,860,396.26 | ||
| Amendment Flag | true | ||
| Amendment Description | Quantum Computing Inc. (the “Company,” “we,” “us,” “our” and other similar terms) is filing this Amendment No. 3 (this “Third Amendment”) to its Annual Report on Form 10-K for the year ended December 31, 2022, as filed with the Securities and Exchange Commission on March 30, 2023 (the “Original Form 10-K”) and as amended by Amendment No. 1 to the Original Form 10-K filed on April 14, 2023 and Amendment No. 2 to the Original Form 10-K filed on June 26, 2023, for the purpose of amending the beneficial ownership table contained in Part III, Item 12 and updating the exhibit index contained in Part IV, Item 15 to include the Company’s Amended and Restated By-Laws, Amended and Restated Certificate of Incorporation and 2022 Equity Incentive Plan that were adopted and approved by the shareholders at the Company’s annual meeting held on September 21, 2022.Accordingly, this Third Amendment consists only of the facing page, this explanatory note, Item 12, Item 15, the signature pages to Form 10-K and the applicable exhibits. The Original Form 10-K and Amendment No. 1 and Amendment No. 2 thereto are otherwise unchanged. This Third Amendment should be read in conjunction with the Original Form 10-K and Amendment No. 1 and Amendment No. 2 thereto. Further, this Third Amendment does not reflect any subsequent events occurring after the filing date of the Original Form 10-K and does not modify or update in any way the disclosures made in the Original Form 10-K or Amendment No. 1 or Amendment No. 2 thereto except as described above. | ||
| Entity Central Index Key | 0001758009 | ||
| Entity Current Reporting Status | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Filer Category | Non-accelerated Filer | ||
| Entity Well-known Seasoned Issuer | No | ||
| Document Period End Date | Dec. 31, 2022 | ||
| Document Fiscal Year Focus | 2022 | ||
| Document Fiscal Period Focus | FY | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| ICFR Auditor Attestation Flag | false | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Entity File Number | 001-40615 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 82-4533053 | ||
| Entity Address, Address Line One | 215 Depot Court SE | ||
| Entity Address, Address Line Two | Suite 215 | ||
| Entity Address, City or Town | Leesburg | ||
| Entity Address, State or Province | VA | ||
| Entity Address, Postal Zip Code | 20175 | ||
| City Area Code | (703) | ||
| Local Phone Number | 436-2121 | ||
| Title of 12(b) Security | Common Stock, par value $.0001 | ||
| Security Exchange Name | NASDAQ | ||
| Entity Interactive Data Current | Yes | ||
| Auditor Name | BF Borgers CPA PC | ||
| Auditor Location | Lakewood, CO | ||
| Auditor Firm ID | 5041 |
