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Commitments and Contingencies - Legal Proceeding (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract] |  |
Provision for loss contingency | $ 0 |
Escrow receivable | $ 1,600,000 | $ 1,600,000

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- Definition Business Combination, Escrow Receivable + References No definition available. + Details
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Namespace Prefix: | forge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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