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STOCK-BASED COMPENSATION - Narrative (Details) $ in Millions |  |  | 1 Months Ended | 6 Months Ended |  |  |  |
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Jan. 01, 2021 shares | Feb. 08, 2018 | Aug. 02, 2022 USD ($) shares | Mar. 31, 2022 shares | Jul. 31, 2021 shares | Apr. 30, 2021 tranche shares | Apr. 30, 2020 user shares | Apr. 30, 2019 user tranche shares | Jun. 30, 2022 USD ($) shares | Jun. 30, 2021 USD ($) | Dec. 31, 2021 shares | Sep. 30, 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 | $ |  |  |  |  |  |  |  |  | $ 0.8 | $ 0.4 |  |  |  |
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 | $ |  |  |  |  |  |  |  |  | $ 0.5 |  |  |  |  |
Compensation not yet recognized | $ |  |  |  |  |  |  |  |  | $ 1.5 |  |  |  |  |
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 |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 2,072,000 |  |  |  |  |
Unvested PSU (in shares) |  |  |  |  |  |  |  |  | 3,581,000 |  | 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) |  |  |  |  |  |  |  |  | 1,803,409 |  |  |  |  |
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) |  |  |  | 269,202 |  |  | 476,608 |  |  |  |  | 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions | user |  |  |  |  |  |  |  | 0.50 |  |  |  |  |  |
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 period |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |
Performance conditions | user |  |  |  |  |  |  |  | 0.25 |  |  |  |  |  |
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 period |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |
Performance conditions | user |  |  |  |  |  |  |  | 0.25 |  |  |  |  |  |
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) |  |  | 575,592 |  |  |  |  |  |  |  |  |  |  |
Compensation not yet recognized, awards other than options | $ |  |  | $ 7.6 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Restricted stock units | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Restricted stock units | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |

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