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Debt - Schedule of Changes in outstanding warrants (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Debt Disclosure [Abstract] |  |  |  |
Beginning balance, Warrants |  |  | 6,836,237 | 1,750,000
Beginning balance |  |  | $ 74,515 | $ 9,520
Exercise of Original Warrants |  |  | 0 | (1,750,000)
Exercise of Original Warrants |  |  | $ 0 | $ (7,752)
Gain from change in fair value of warrant liability | $ 8,887 | $ 2,836 | (39,855) | (1,768)
Ending balance | $ 34,660 | $ 0 | $ 34,660 | $ 0
Ending balance, Warrants | 6,836,237 | 0 | 6,836,237 | 0

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- Definition Exercise of original warrants + References No definition available. + Details
Name: | ftci_ExerciseOfOriginalWarrants
Namespace Prefix: | ftci_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair Value Of the Warrants Upon Exercise + References No definition available. + Details
Name: | ftci_FairValueOfTheWarrantsUponExercise
Namespace Prefix: | ftci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Warrant liability + References No definition available. + Details
Name: | ftci_WarrantLiability
Namespace Prefix: | ftci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration