Represents the number of shares in a unit.

No definition available.

Name:	glta_NumberOfSharesIssuedPerUnit
Namespace Prefix:	glta_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of warrants in a unit.

+ References

No definition available.

+ Details

Name:	glta_NumberOfWarrantsIssuedPerUnit
Namespace Prefix:	glta_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of new units issued during the period.

+ References

No definition available.

+ Details

Name:	glta_UnitsIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	glta_
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

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

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

INITIAL PUBLIC OFFERING (Details) - USD ($)			7 Months Ended	10 Months Ended
INITIAL PUBLIC OFFERING (Details) - USD ($)	Jul. 13, 2021	Jul. 09, 2021	Sep. 30, 2021	Dec. 31, 2021	Sep. 30, 2022
Subsidiary, Sale of Stock [Line Items]
Sale of units in public offering, net			$ 140,366,114	$ 140,317,771
Class A ordinary shares
Subsidiary, Sale of Stock [Line Items]
Common shares, par value, (per share)				$ 0.0001	$ 0.0001
Initial Public Offering
Subsidiary, Sale of Stock [Line Items]
Number of units sold		12,500,000
Price per share		$ 10.00		$ 10.00
Sale of units in public offering, net		$ 125,000,000
Number of warrants in a unit		0.5
Initial Public Offering \| Class A ordinary shares
Subsidiary, Sale of Stock [Line Items]
Price per share		$ 0.0001
Common shares, par value, (per share)		$ 0.0001
Number of shares in a unit		1
Number of warrants in a unit		0.5
Number of shares issuable per warrant		1
Exercise price of warrants		$ 11.50
Over-allotment option
Subsidiary, Sale of Stock [Line Items]
Number of units sold	1,875,000			1,875,000
Price per share	$ 10.00
Sale of units in public offering, net	$ 18,750,000