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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