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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
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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

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- 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

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- 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

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- 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

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- 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