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Statement of Changes in Stockholders' Equity (Parenthetical)	Oct. 14, 2020 shares
Class B Common Stock | Subsequent Event
Number of shares forfeited (in shares)	525,000

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- Definition

The number of shares of the company that are forfeited during the period.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
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Balance Type:
Period Type: