Exercise price of warrants after reverse stock split.

No definition available.

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Namespace Prefix:	note_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares issuable per warrant after reverse stock split.

+ References

No definition available.

+ Details

Name:	note_NumberOfSharesIssuablePerWarrantAfterReverseStockSplit
Namespace Prefix:	note_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Warrant liability fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	note_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Warrants exercised.

+ References

No definition available.

+ Details

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Namespace Prefix:	note_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

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Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=note_PublicWarrantsMember
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Data Type:	na
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Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=us-gaap_PrivatePlacementMember
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Warrant Liabilities - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Aug. 22, 2025
Class Of Warrant Or Right [Line Items]
Effective price per share price of warrant after reverse stock split			$ 87.82
Common Class A
Class Of Warrant Or Right [Line Items]
Number of shares issuable per warrant after reverse stock split	0.130952		0.130952
Effective price per share price of warrant after reverse stock split	$ 87.82
Public Warrants
Class Of Warrant Or Right [Line Items]
Warrants outstanding	8,358,964
Warrants exercised	0
Public Warrants \| Common Class A
Class Of Warrant Or Right [Line Items]
Warrant to purchase of common stock shares issued	1,094,625
Private Placement Warrants
Class Of Warrant Or Right [Line Items]
Warrants outstanding	7,000,000
Warrants exercised	0
Exercise price	$ 0
Warrant liability fair value	$ 0	$ 477
Private Placement Warrants \| Common Class A
Class Of Warrant Or Right [Line Items]
Warrant to purchase of common stock shares issued	916,666