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Summary of Significant Accounting Policies - Government Assistance (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2023 | Dec. 30, 2023 | Dec. 31, 2022
Accounting Policies [Abstract] |  |  |
Deferred grant | $ 18,000 | $ 18,000 | $ 0
Deferred Government Grant Liability, Term | 5 years |  |

X
- Definition Deferred Government Grant Liability + References No definition available. + Details
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Namespace Prefix: | form_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Government Grant Liability, Term + References No definition available. + Details
Name: | form_DeferredGovernmentGrantLiabilityTerm
Namespace Prefix: | form_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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