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EQUITY INVESTMENTS AND BUSINESS COMBINATIONS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 13, 2021
May 11, 2021
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2023
Jul. 31, 2023
May 11, 2022
Mar. 04, 2022
Feb. 11, 2022
Aug. 23, 2021
Aug. 22, 2021
Jul. 31, 2021
Nebula                        
Equity Investments and Business Combinations Details [Line Items]                        
Subsidiary, ownership percentage, parent                     100.00%  
ODU Acquisition                        
Equity Investments and Business Combinations Details [Line Items]                        
Ownership percentage   100.00%                    
Payments to acquire businesses, gross   $ 4.5                    
Payments to acquire businesses, net of cash acquired   4.0                    
Holdback for indemnification   $ 0.5                    
Payment from escrow funds to previous owners             $ 0.5          
Learn 25 Acquisition                        
Equity Investments and Business Combinations Details [Line Items]                        
Ownership percentage 100.00%                      
Payments to acquire businesses, net of cash acquired $ 1.4                      
Holdback for indemnification 0.2                      
Payment from escrow funds to previous owners               $ 0.2        
Business combination, consideration transferred 1.5                      
Additional earnout consideration based on achievement of certain revenue targets $ 0.6                      
Payment for earnout consideration                 $ 0.5      
Spiegel Venture                        
Equity Investments and Business Combinations Details [Line Items]                        
Ownership percentage                       32.00%
Ownership amount                       $ 3.3
Call option exercise period         30 days              
Put option, exercise period         60 days              
Impairment of equity method investment       $ 2.0 $ 2.0              
Spiegel Venture | Accounts Payable                        
Equity Investments and Business Combinations Details [Line Items]                        
Equity method investment, holdback payment liability           $ 0.9            
Nebula                        
Equity Investments and Business Combinations Details [Line Items]                        
Ownership percentage         16.875%         12.00%    
Ownership amount                   $ 6.0    
Board representation, percentage         25.00%              
Equity investments     $ 0.8                  
Additional ownership interest, percentage     1.625%                  
Impairment of equity method investment     $ 2.3   $ 2.3