Debt Instrument, Default Penalty, Amount

No definition available.

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Namespace Prefix:	flks_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Instrument, Default Penalty, Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	flks_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

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+ Details

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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))
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+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix:
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Period Type:

PREPAID EXPENSES AND OTHER CURRENT ASSETS - Narrative (Details) - USD ($)	Sep. 02, 2025	Sep. 30, 2025	Dec. 31, 2024	Jul. 31, 2024
Short-term Debt [Line Items]
Notes payable		$ 0	$ 221,866
Promissory Note
Short-term Debt [Line Items]
Principal amount	$ 200,000
Interest rate	0.00%
Default penalty charge amount	$ 75,000
Default penalty rate	18.00%
Note Payable
Short-term Debt [Line Items]
Principal amount				$ 400,000
Interest rate				9.74%