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v3.25.3

Revenue - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Revenue rewards | $ 400,000 | $ 400,000 | $ 1,500,000 | $ 1,200,000 |
Contract liability related to deferred subscription revenues | 300,000 |  | 300,000 |  | $ 300,000
Contract liability related to unearned portion of bonus | 500,000 |  | 500,000 |  | $ 600,000
Incremental costs | $ 0 | $ 0 | $ 0 | $ 0 |

X
- Definition Contract liability related to deferred subscription revenues. + References No definition available. + Details
Name: | fld_ContractLiabilityRelatedToDeferredSubscriptionRevenues
Namespace Prefix: | fld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contract liability related to unearned portion of bonus. + References No definition available. + Details
Name: | fld_ContractLiabilityRelatedToUnearnedPortionOfBonus
Namespace Prefix: | fld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Incremental costs. + References No definition available. + Details
Name: | fld_IncrementalCosts
Namespace Prefix: | fld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Revenue rewards + References No definition available. + Details
Name: | fld_RevenueRewards
Namespace Prefix: | fld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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