UNAUDITED CONDENSED STATEMENT OF CHANGES IN SHAREHOLDERS' DEFICIT (Parenthetical)	Sep. 30, 2020 shares
Class B ordinary shares
Weighted average shares subject to forfeiture	1,237,500

Represents the maximum number of common stock shares subject to forfeiture.

No definition available.

Name:	qellu_MaximumCommonStockSharesSubjectToForfeiture
Namespace Prefix:	qellu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant