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Leases - Additional Information (Details) | Jun. 30, 2026
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Leases [Abstract] |
Operating leases term of expiration | 2034-03
Finance leases term of expiration | 2026-12

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- Definition Finance lease term of expiration. + References No definition available. + Details
Name: | flgt_FinanceLeaseTermOfExpiration
Namespace Prefix: | flgt_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | instant

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- Definition Operating lease term of expiration + References No definition available. + Details
Name: | flgt_OperatingLeaseTermOfExpiration
Namespace Prefix: | flgt_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | instant

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