Condensed Statement of Operations (Unaudited) (Parenthetical) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2020
Income Statement [Abstract]
Aggregate shares subject to possible redemption		16,761,273
Income attributable to common stock subject to possible redemption	$ 42,051	$ 884,450

The fair value of shares that would be issued, determined under the conditions specified in the contract if the settlement were to occur at the reporting date.

No definition available.

Name:	gnrs_IncomeAttributableToCommonStockSubjectToPossibleRedemption
Namespace Prefix:	gnrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration