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COMMITMENTS AND CONTINGENCIES - Additional information (Details) |  | 9 Months Ended | 10 Months Ended
--- | --- | --- | ---
Jul. 13, 2021 shares | Sep. 30, 2022 USD ($) item $ / shares | Dec. 31, 2021 USD ($) $ / shares shares
Subsidiary, Sale of Stock [Line Items] |  |  |
Cash underwriting discount per unit |  | $ 0.20 |
Aggregate underwriting discount | $ |  | $ 2,875,000 | $ 2,875,000
Deferred fee per unit |  | $ 0.35 |
Deferred underwriting fees | $ |  | $ 5,031,250 | $ 5,031,250
Maximum number of demands for registration of securities | item |  | 3 |
Over-allotment option |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Number of units sold | shares | 1,875,000 |  | 1,875,000
Cash underwriting discount per unit |  |  | $ 0.20
Deferred fee per unit |  |  | $ 0.35
Underwriting option period |  | 45 days | 45 days

X
- Definition The carrying value of the cash underwriting discount in the aggregate if the underwriter's option to purchase additional units is exercised in full. + References No definition available. + Details
Name: | glta_AggregateUnderwriterCashDiscount
Namespace Prefix: | glta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The carrying value as of balance sheet date of underwriting compensation deferred, classified as noncurrent. + References No definition available. + Details
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Namespace Prefix: | glta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred underwriting compensation per unit in connection with the public offering to underwriters. + References No definition available. + Details
Name: | glta_DeferredUnderwritingCompensationPerUnit
Namespace Prefix: | glta_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum number of demands for registration of securities. + References No definition available. + Details
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Namespace Prefix: | glta_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of cash underwriting discount per unit in connection with the public offering to underwriters. + References No definition available. + Details
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Namespace Prefix: | glta_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents duration of underwriting option period. + References No definition available. + Details
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Namespace Prefix: | glta_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of new units issued during the period. + References No definition available. + Details
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Namespace Prefix: | glta_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |