Cover Page - USD ($)	7 Months Ended
	Dec. 31, 2020	Mar. 09, 2021
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Entity Registrant Name	Colonnade Acquisition Corp.
Entity Central Index Key	0001816581
Entity Interactive Data Current	Yes
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity File Number	001-39463
Current Fiscal Year End Date	--12-31
Entity Incorporation, State or Country Code	E9
Entity Shell Company	true
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Address, Address Line One	1400 Centrepark Blvd
Entity Address, Address Line Two	Ste 810
Entity Address, City or Town	West Palm Beach
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33401
City Area Code	561
Local Phone Number	712-7860
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Title of 12(b) Security	Class A ordinary shares, par value $0.0001 per share
Trading Symbol	CLA
Security Exchange Name	NYSE
ICFR Auditor Attestation Flag	false
Entity Public Float	$ 270,000,000
Capital Units [Member]
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-half of one redeemable warrant
Trading Symbol	CLA.U
Security Exchange Name	NYSE
Redeemable Warrants [Member]
Document Information [Line Items]
Title of 12(b) Security	Redeemable warrants, each warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share
Trading Symbol	CLA WS
Security Exchange Name	NYSE
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		20,000,000
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,000,000