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Convertible Note Derivative - Schedule of Components of Changes to Fair Value of Convertible Note Derivative (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2022 USD ($)
Convertible Note Derivative [Abstract]
Convertible note derivative (asset) liability - beginning of period	$ 0
Additions	24,896
Fair value adjustment (gain) loss	(13,909)
Convertible note derivative (asset) liability - end of period	$ 10,987

X

- Definition

Convertible note derivative.

+ References

No definition available.

+ Details

Name:	feam_ConvertibleNoteDerivativeAbstract
Namespace Prefix:	feam_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Convertible note derivative, additions.

+ References

No definition available.

+ Details

Name:	feam_ConvertibleNoteDerivativeAdditions
Namespace Prefix:	feam_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Convertible note derivative liability.

+ References

No definition available.

+ Details

Name:	feam_ConvertibleNoteDerivativeLiability
Namespace Prefix:	feam_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration