Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 29, 2022	Jun. 30, 2021
Document Information Line Items
Entity Registrant Name	DUNE ACQUISITION CORPORATION
Trading Symbol	DUNE
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Public Float			$ 168,705,000
Amendment Flag	false
Entity Central Index Key	0001817232
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, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Shell Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-39819
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-1617911
Entity Address, Address Line One	700 S. Rosemary Avenue
Entity Address, Address Line Two	Suite 204
Entity Address, City or Town	West Palm Beach
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33401
City Area Code	1 (917)
Local Phone Number	742-1904
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Auditor Name	WithumSmith+Brown, PC
Auditor Location	New York
Auditor Firm ID	100
Class A Common Stock
Document Information Line Items
Entity Common Stock, Shares Outstanding		17,250,000
Class B Common Stock
Document Information Line Items
Entity Common Stock, Shares Outstanding		4,312,500