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. 2 (this “Second 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 the Amendment No. 1 to the Original Form 10-K filed on April 14, 2023, for the purpose of updating Note 3 to our Consolidated Financial Statements to: (i) clearly indicate that our merger with QPhoton, Inc. in 2022 (the “Merger”) was accounted for as a business combination under FASB Accounting Standards Codification Topic 805; (ii) include a purchase price allocation table in connection with the Merger; (iii) describe how we valued the specific assets and liabilities acquired in the Merger; (iv) describe how we valued the stocks and warrants issued as the merger consideration; (v) explain how we determined the fair values of the intangible assets we acquired and separately identify the amount of goodwill acquired; and (vi) describe our consideration of the disclosure guidance in ASC 805-10-50.Accordingly, this Second Amendment consists only of the facing page, this explanatory note, the Financial Statements and the Notes to the Financial Statements, the signature pages to Form 10-K and the submitted exhibits. The Original Form 10-K and Amendment No.1 thereto are otherwise unchanged. This Second Amendment should be read in conjunction with the Original Form 10-K and Amendment No. 1 thereto. Further, this Second Amendment does not reflect any subsequent events occurring after the original 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 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 Firm ID	5041
Auditor Name	BF Borgers CPA PC
Auditor Location	Lakewood, CO