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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Sep. 09, 2024
Jun. 30, 2023
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   94,210,626  
Entity Public Float     $ 46,073,808
Amendment Flag true    
Amendment Description Quantum Computing Inc. (the “Company,” “we,” “us,” “our” and other similar terms) is filing this Amendment No. 1 (this “Amendment”) to its Annual Report on Form 10-K for the year ended December 31, 2023, as filed with the Securities and Exchange Commission (the “SEC”) on April 1, 2024 (the “Original Form 10-K”), to restate its consolidated financial statements, including the notes thereto, for the years ended December 31, 2023 and 2022, contained in the Original Form 10-K, and to replace the Report of Independent Registered Public Accounting Firm prepared by BF Borgers CPA PC (“BF Borgers”) included in the Original Form 10-K with the Report of Independent Registered Public Accounting Firm from BPM LLP (“BPM”) included in this Amendment, and to make certain other changes as described herein. This Amendment is being filed as a result of the SEC’s order of May 3, 2024 suspending BF Borgers from appearing and practicing as an accountant before the SEC and the Company’s subsequent retention of BPM to replace BF Borgers as its independent registered public accounting firm.The following items have also been amended to reflect the above-referenced amendments: ●Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations; ●Part III, Item 14. Principal Accountant Fees and Services; and ●Part IV, Item 15. Exhibits and Financial Statement Schedules. The Company’s Principal Executive Officer and Principal Financial Officer have provided new certifications dated as of the date of this filing in connection with this Amendment (Exhibits 31.1, 31.2, 32.1 and 32.2).The restated and re-audited consolidated financial statements update and revise items in our consolidated financial statements and footnotes to the consolidated financial statements, including (1) expanding and revising certain disclosures; (2) changing the presentation of certain classifications, including the Series A Preferred Stock dividends and categorization of operating expenses; and (3) adjusting certain errors, omissions or changes in accounting policies, including (i) correcting the purchase accounting relating to the Company’s June 2022 merger with QPhoton, Inc., (ii) adjusting stock-based compensation expenses and related prior period retained earnings to reflect a change in our accounting policy election to account for forfeitures as they occur, (iii) adjusting the valuation of the Series A convertible preferred stock warrants, (iv) correcting the historical and subsequent accounting for debt and equity issuance costs, (v) reserving a collection risk for loans receivable; and (vi) adjusting the recognition period for certain operating expenditures.Except as described above, no other portion of the Original Form 10-K is being amended and this Amendment does not reflect any events occurring after the filing of the Form 10-K.    
Entity Central Index Key 0001758009    
Entity Current Reporting Status No    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
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 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    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Document Financial Statement Error Correction [Flag] true    
Document Financial Statement Restatement Recovery Analysis [Flag] false    
Documents Incorporated by Reference [Text Block]

None

    
Auditor Firm ID 207    
Auditor Name BPM LLP    
Auditor Location San Jose, California