Proceeds From Grants Received

No definition available.

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

- Definition

Revenue From Grants, Maximum Award

+ References

No definition available.

+ Details

Name:	flks_RevenueFromGrantsMaximumAward
Namespace Prefix:	flks_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

- Definition

Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_GrantsReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase (decrease) in receivables classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

+ Details

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

- Details

Name:	srt_CounterpartyNameAxis=flks_CPRITMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_GrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

GRANT RECEIVABLE FROM CPRIT (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
GRANT RECEIVABLE FROM CPRIT (Details) - USD ($)	Jun. 30, 2016	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Grants receivable		$ 0	$ (1,480,490)
Award amount	$ 18,700,000			$ 16,100,000
CPRIT
Accounts, Notes, Loans and Financing Receivable [Line Items]
Grants received		16,100,000
Grant \| CPRIT
Accounts, Notes, Loans and Financing Receivable [Line Items]
Grants receivable from CPRIT		0		$ 0
Award amount		$ 100,000	$ 1,500,000