Debt Instrument, Accordion Feature, Increase Limit

No definition available.

Name:	frmi_DebtInstrumentAccordionFeatureIncreaseLimit
Namespace Prefix:	frmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Advance Funding Premium, Percentage

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentAdvanceFundingPremiumPercentage
Namespace Prefix:	frmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Aggregate Cap In Shares

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentAggregateCapInShares
Namespace Prefix:	frmi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Applicable Amortization Principal Amount, Percentage

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentApplicableAmortizationPrincipalAmountPercentage
Namespace Prefix:	frmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Committed Equity After Issuance Date

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentCommittedEquityAfterIssuanceDate
Namespace Prefix:	frmi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Committed Principal, Reduction Amount

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentCommittedPrincipalReductionAmount
Namespace Prefix:	frmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Committed Principal, Reduction Period

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentCommittedPrincipalReductionPeriod
Namespace Prefix:	frmi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Covenant, Collateral Coverage, Percentage

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentCovenantCollateralCoveragePercentage
Namespace Prefix:	frmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Liquidity Amount, Minimum

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentCovenantLiquidityAmountMinimum
Namespace Prefix:	frmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Equipment Funded, Percentage

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentEquipmentFundedPercentage
Namespace Prefix:	frmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Equipment Funded, Remaining Percentage

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentEquipmentFundedRemainingPercentage
Namespace Prefix:	frmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Equity Line Of Credit Proceeds, Percentage

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentEquityLineOfCreditProceedsPercentage
Namespace Prefix:	frmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Exit Fee, Amount

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentExitFeeAmount
Namespace Prefix:	frmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Instrument, Exit Fee, Percentage

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentExitFeePercentage
Namespace Prefix:	frmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Exit Fee, Period

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentExitFeePeriod
Namespace Prefix:	frmi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Interest Rate, Default Percentage

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentInterestRateDefaultPercentage
Namespace Prefix:	frmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Per-Payment Cap In Shares

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentPerPaymentCapInShares
Namespace Prefix:	frmi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Periodic Payment, Percentage

+ References

No definition available.

+ Details

Name:	frmi_DebtInstrumentPeriodicPaymentPercentage
Namespace Prefix:	frmi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt, Net - Schedule of Debt [Line Items]

+ References

No definition available.

+ Details

Name:	frmi_DebtNetScheduleOfDebtLineItems
Namespace Prefix:	frmi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-4

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481303/470-50-40-2

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481303/470-50-40-4

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=frmi_EquipmentSupplyLoanFinancingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=frmi_KeystoneMasterLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=frmi_BealEquipmentFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=frmi_YorkvillePromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	frmi_ExitFeeTermAxis=frmi_ExitFeeTermOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	frmi_ExitFeeTermAxis=frmi_ExitFeeTermTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	frmi_ExitFeeTermAxis=frmi_ExitFeeTermThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt, net - Narrative (Details) - USD ($) $ in Thousands				3 Months Ended
Debt, net - Narrative (Details) - USD ($) $ in Thousands	Mar. 30, 2026	Mar. 26, 2026	Feb. 10, 2026	Mar. 31, 2026	Mar. 31, 2025	Feb. 28, 2026	Feb. 19, 2026	Dec. 31, 2025
Debt, Net - Schedule of Debt [Line Items]
Loss on extinguishment of debt			$ (24,753)	$ (24,753)	$ 0
Total debt				439,127				$ 148,986
MUFG Equipment Financing
Debt, Net - Schedule of Debt [Line Items]
Total debt				396,567				0
Keystone Equipment Financing
Debt, Net - Schedule of Debt [Line Items]
Total debt				39,540				0
Keystone Equipment Financing \| Secured Debt
Debt, Net - Schedule of Debt [Line Items]
Total debt				39,540
Accelerate procurement							$ 120,000
Increase amount							$ 100,000
Equipment funded percentage							80.00%
Equipment funded remaining percentage							20.00%
Liquidity amount, covenant						$ 20,000
Collateral coverage covenant percentage						110.00%
Beal Equipment Financing
Debt, Net - Schedule of Debt [Line Items]
Total debt				$ 3,020				$ 0
Yorkville Promissory Note
Debt, Net - Schedule of Debt [Line Items]
Interest rate	0.00%
Accelerate procurement	$ 156,250
Interest rate in event of default	18.00%
Committed principal, reduction amount	$ 26,042
Committed principal, reduction period	30 days
Advance funding premium	4.00%
Committed equity after issuance date	30 days
Monthly installment amount	$ 10,000
Per-payment cap (in shares)	8,000,000
Aggregate cap (in shares)	40,000,000
Applicable amortization principal amount percentage	102.00%
Equity line of credit proceeds percentage	100.00%
Yorkville Promissory Note \| Exit Fee, Term One
Debt, Net - Schedule of Debt [Line Items]
Exit fee percentage	0.00%
Exit fee period	180 days
Yorkville Promissory Note \| Exit Fee, Term Two
Debt, Net - Schedule of Debt [Line Items]
Exit fee percentage	1.00%
Yorkville Promissory Note \| Exit Fee, Term Two \| Minimum
Debt, Net - Schedule of Debt [Line Items]
Exit fee period	181 days
Yorkville Promissory Note \| Exit Fee, Term Two \| Maximum
Debt, Net - Schedule of Debt [Line Items]
Exit fee period	365 days
Yorkville Promissory Note \| Exit Fee, Term Three
Debt, Net - Schedule of Debt [Line Items]
Exit fee percentage	1.33%
Exit fee period	365 days
Line of Credit \| MUFG Equipment Financing
Debt, Net - Schedule of Debt [Line Items]
Aggregate principal amount			$ 500,000
Variable interest rate			4.00%
Principal payment percentage			10.00%
Interest rate			5.00%
Line of Credit \| Beal Equipment Financing
Debt, Net - Schedule of Debt [Line Items]
Interest rate		12.00%
Total debt		$ 3,020
Debt instrument, unused borrowing capacity, amount		$ 165,000
Interest rate in event of default		14.00%
Loan maturity period		33 months
Commitment fee amount		$ 22,900
Unused capacity percentage		1.00%
Exit fee		$ 37,000