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

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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. 07, 2023 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, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Oct. 01, 2023 USD ($)	Jun. 30, 2023 shares	Dec. 31, 2022 shares	Dec. 31, 2021	Sep. 30, 2021 shares	Jan. 01, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)													405,830
Number of shares authorized, annual increase									5.00%
Number of additional shares authorized (in shares)	1,673,858
Lease obligation incurred \| $									$ 1.6	$ 1.0
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized									2 years 2 months 8 days
Granted (in shares)									3,145,000
Unvested PSU (in shares)									6,160,000				5,956,000
Restricted stock units \| Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)									3,145,035
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					269,202			6,666
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 \| 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				878,969,000			334,771,000
Subsequent Event \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			414,233
Compensation not yet recognized, awards other than options \| $											$ 4.9