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CAPITAL RESERVE- Summary of Capital Reserve (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Capital Reserve [Roll Forward] |  |
Opening carrying amount | $ 55,953 | $ 19,979
Share options exercised (Note 11) | 138 | 0
Share capital issued (Note 9) | 7,619 | 0
Closing carrying amount | $ 63,711 | $ 19,979

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- Definition Capital reserve carrying amount. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Capital Reserve + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Share warrants exercised. + References No definition available. + Details
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Namespace Prefix: | gamb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow for share issue costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17&doctype=Standard -URIDate 2021-03-24 + Details
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