Borrowings premium percentage depending on timing.

No definition available.

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- Definition

Cash outflow for redemption of borrowings included in accrued interest.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Fair value of borrowings exceeded nominal value.

+ References

No definition available.

+ Details

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- Definition

Gain on repurchase of borrowings.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Increase in percentage of interest rate if not maintain certain leverage ratio.

+ References

No definition available.

+ Details

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- Definition

Redemption premium percentage.

+ References

No definition available.

+ Details

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- Definition

Redemption premium recorded within “Repurchases and redemptions of senior secured bonds".

+ References

No definition available.

+ Details

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

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
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-URIDate 2021-03-24

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_7&doctype=Standard
-URIDate 2021-03-24

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

The cash outflow for interest paid, classified as financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2021-01-01
-Paragraph 31
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-URIDate 2021-03-24

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of interest recognised as a liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2021-03-24

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for debt 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for repayments of bonds, notes and debentures.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of loans received from banks that have not been secured by collateral. [Refer: Loans received]

+ References

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=gamb_SoldToThirdPartiesAdditionalBondsFromTreasuryMember
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- Details

Name:	ifrs-full_MeasurementAxis=ifrs-full_AtFairValueMember
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- Details

Name:	ifrs-full_BorrowingsByNameAxis=gamb_EuroDenominatedSeniorSecuredBondsDueInTwoThousandAndTwentyOneMember
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Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
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Data Type:	na
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Name:	ifrs-full_BorrowingsByNameAxis=gamb_ConvertiblePromissoryNotesMember
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- Details

Name:	ifrs-full_BorrowingsByNameAxis=gamb_SeniorSecuredBondsMember
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- Details

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Borrowings - Additional Information (Details) € in Thousands, $ in Thousands	1 Months Ended				12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 EUR (€)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Jan. 01, 2019 USD ($)	Jan. 01, 2019 EUR (€)
Disclosure Of Detailed Information About Borrowings [Line Items]
Nominal amount								$ 17,974				€ 16,000
Outstanding balance	$ 5,960				$ 5,944	$ 5,960
Accrued interest								369
Interest paid					509	1,656		2,246
Sold to Third Parties Additional Bonds from Treasury
Disclosure Of Detailed Information About Borrowings [Line Items]
Nominal amount								560				€ 500
At Fair Value
Disclosure Of Detailed Information About Borrowings [Line Items]
Outstanding balance								$ 18,242
Euro-Denominated Senior Secured Bonds due in 2021
Disclosure Of Detailed Information About Borrowings [Line Items]
Interest rate								10.50%				10.50%
Euro-Denominated Senior Secured Bonds due in 2021 \| Minimum
Disclosure Of Detailed Information About Borrowings [Line Items]
Premium percentage								1.05%
Increase in percentage of interest rate if not maintain certain leverage ratio								0.50%
Euro-Denominated Senior Secured Bonds due in 2021 \| Maximum
Disclosure Of Detailed Information About Borrowings [Line Items]
Premium percentage								5.25%
Increase in percentage of interest rate if not maintain certain leverage ratio								1.50%
Convertible Promissory Notes
Disclosure Of Detailed Information About Borrowings [Line Items]
Interest rate													10.00%	10.00%
Nominal amount													$ 2,939	€ 2,625
Outstanding balance													1,541
Senior Secured Bonds
Disclosure Of Detailed Information About Borrowings [Line Items]
Nominal amount	13,364		$ 4,975			13,364			€ 11,700		€ 4,364		$ 17,665	€ 15,500
Fair value of borrowings exceeded nominal value								$ 270
Cash payment for repurchase/redemption of borrowings	$ 13,785	€ 12,069	$ 3,567	€ 3,123
Redemption premium percentage	3.15%	3.15%
Cash outflow for redemption of borrowings included in accrued interest	$ 14,050	€ 12,301
Gain on repurchase of borrowings						1,417	€ 1,241
Redemption premium recorded within “Repurchases and redemptions of senior secured bonds"						$ 421	€ 369
Unsecured Loan Granted under Payment Protection Plan Program
Disclosure Of Detailed Information About Borrowings [Line Items]
Interest rate										1.00%
Payment Protection Plan program
Disclosure Of Detailed Information About Borrowings [Line Items]
Unsecured loan granted										$ 180
Term Loan Agreement with Investor
Disclosure Of Detailed Information About Borrowings [Line Items]
Interest rate	8.00%					8.00%			8.00%
Outstanding balance	$ 6,000					$ 6,000
Transaction costs directly attributable to issuance	$ 66
Interest paid					$ 484