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SEGMENTS - Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Adjusted contribution	$ 24,738	$ 16,978	$ 64,216	$ 47,371
Plus: FI Share and other third-party costs	31,681	17,604	76,921	55,494
Revenues	56,419	34,582	141,137	102,865
Non-cash gain on financial institution share			3,500
Cardlytics Direct
Segment Reporting Information [Line Items]
Adjusted contribution	24,738	16,906	64,216	47,368
Plus: FI Share and other third-party costs	31,681	17,514	76,921	54,271
Revenues	56,419	34,420	141,137	101,639
Other Platform Solutions
Segment Reporting Information [Line Items]
Adjusted contribution	0	72	0	3
Plus: FI Share and other third-party costs	0	90	0	1,223
Revenues	$ 0	$ 162	$ 0	$ 1,226

X

- Definition

Adjusted contribution represents our revenue less FI Share and other third-party costs. We refined our definition of adjusted contribution used by our CODM to exclude the impact of non-cash charges related to the issuance of equity to our FI partners and the impact of amortization and impairment of deferred FI implementation costs.

+ References

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- Definition

Financial Institution Share And Other Third-Party Costs, Excluding Non-cash Equity Expense and Deferred Implementation Costs

+ References

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- Definition

Gain (Loss) On Financial Institution Share

+ References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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- 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.

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