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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Statement of Cash Flows [Abstract] |  |
Loan costs | $ 200 | $ 200

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- Definition The amount of note payable, loan costs. + References No definition available. + Details
Name: | fthm_NotePayableLoanCosts
Namespace Prefix: | fthm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration