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Performance Shares, Stock Closing Price Period

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Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights, Achievement Percentage

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Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Conditions

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Share-based Compensation Arrangement by Share-based Payment Award, Number Of Shares Authorized, Annual Percentage Increase

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Amount of increase in lease obligation from new lease.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Purchase price of common stock expressed as a percentage of its fair value.

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STOCK-BASED COMPENSATION - Narrative (Details) $ in Millions			1 Months Ended						9 Months Ended
	Jan. 01, 2021 shares	Feb. 08, 2018	Nov. 01, 2022 USD ($) shares	Mar. 31, 2022	Jul. 31, 2021 shares	Apr. 30, 2021 tranche shares	Apr. 30, 2020 user shares	Apr. 30, 2019 tranche shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($) shares	Jun. 30, 2022 shares	Dec. 31, 2021 shares	Dec. 31, 2020	Jan. 01, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)												2,033,227
Number of shares authorized, annual increase									5.00%
Number of additional shares authorized (in shares)	1,676,682
Lease obligation incurred \| $									$ 1.0	$ 0.5
Award vesting period									4 years
Expiration period									10 years
Bridg Acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)									21,797
Options vested in period, fair value \| $									$ 0.1
Compensation not yet recognized \| $									$ 0.1
Compensation cost not yet recognized									1 year 8 months 12 days
Dosh Holdings, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)									104,098
Options vested in period, fair value \| $									$ 0.7
Compensation not yet recognized \| $									$ 1.0
Minimum \| Bridg Acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period									1 year
Minimum \| Dosh Holdings, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period									1 year
Maximum \| Bridg Acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period									4 years
Maximum \| Dosh Holdings, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period									4 years
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized									3 years 10 days
Granted (in shares)									4,260,000
Unvested PSU (in shares)									5,087,000			2,294,000
Restricted stock units \| Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)									2,519,507
Restricted stock units \| Share-based Compensation Award, Tranche One \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period									4 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested PSU (in shares)								1,252,500
Number of vesting tranches \| tranche								4
Minimum growth rate period								12 months
Advertiser billing period								12 months
EBITDA target period								12 months
Stock closing price period								30 days
Performance Shares \| 2020 PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested PSU (in shares)							476,608			6,666	269,202
ARPU vesting condition period							4 years
Performance Shares \| 2021 PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested PSU (in shares)						110,236				6,667
Number of vesting tranches \| tranche						2
ARPU vesting condition period						4 years
Performance Shares \| Bridg PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested PSU (in shares)					34,344
Performance Shares \| Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				25.00%
Performance Shares \| Share-based Compensation Award, Tranche One \| 2020 PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						12 months	12 months
Unvested PSU (in shares)							443,276
Performance conditions \| user							0.50
Performance Shares \| Share-based Compensation Award, Tranche One \| 2021 PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						12 months
Unvested PSU (in shares)						55,118
Performance Shares \| Share-based Compensation Award, Tranche One \| Bridg PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage					50.00%
Performance Shares \| Share-based Compensation Award, Tranche One \| Minimum \| Bridg PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Achievement percentage					80.00%
Performance Shares \| Share-based Compensation Award, Tranche One \| Maximum \| Bridg PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Achievement percentage					99.999%
Performance Shares \| Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				50.00%
Performance Shares \| Share-based Compensation Award, Tranche Two \| 2020 PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							6 months
Unvested PSU (in shares)							33,332
Performance conditions \| user							0.25
Performance Shares \| Share-based Compensation Award, Tranche Two \| 2021 PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						6 months
Unvested PSU (in shares)						55,118
Performance Shares \| Share-based Compensation Award, Tranche Two \| Bridg PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage					100.00%
Achievement percentage					100.00%
Performance Shares \| Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				50.00%
Performance Shares \| Share-based Payment Arrangement, Tranche Three \| 2020 PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							12 months
Performance conditions \| user							0.25
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized, annual increase													1.00%
ESPP, purchase price percentage		85.00%
ESPP, number of shares authorized, annual increase (in shares)									500,000			711,255,000		335,336,000
Subsequent Event \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			1,870,151
Compensation not yet recognized, awards other than options \| $			$ 17.2
Subsequent Event \| Restricted stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			2 years
Subsequent Event \| Restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years