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Statement of Operations (Parenthetical)	3 Months Ended
	Sep. 30, 2020 shares
Number of shares subject to forfeiture (in shares)	843,750
Over-allotment Option
Number of shares subject to forfeiture (in shares)	843,750

X

- Definition

The number of shares of the company that are subject to forfeiture during the period.

+ References

No definition available.

+ Details

Name:	fgna_NumberOfSharesSubjectToForfeiture
Namespace Prefix:	fgna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: