Document and Entity Information - USD ($)	5 Months Ended
	Dec. 31, 2020	Mar. 29, 2021
Document Information [Line Items]
Document Type	10-K
Entity Voluntary Filers	No
Document Period End Date	Dec. 31, 2020
Entity Registrant Name	Qell Acquisition Corp
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	true
ICFR Auditor Attestation Flag	false
Entity Ex Transition Period	false
Entity Shell Company	true
Entity Public Float		$ 326,282,449.92
Entity Central Index Key	0001821171
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Transition Report	false
Units, each consisting of one share of class A ordinary shares, and one warrant to acquire one-third class A ordinary share
Document Information [Line Items]
Title of 12(b) Security	units, each consisting of one share ofClass A ordinary shares, and one warrant to acquire one-third Class A ordinary share
Trading Symbol	QELLU
Security Exchange Name	NASDAQ
Class A Common Stock
Document Information [Line Items]
Title of 12(b) Security	Class A Common Stock, par value $0.0001 per share
Trading Symbol	QELL
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		32,891,376
Warrants, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50
Document Information [Line Items]
Title of 12(b) Security	Warrants, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50
Trading Symbol	QELLW
Security Exchange Name	NASDAQ
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		9,487,500