v3.20.2
BUSINESS COMBINATIONS - Preliminary purchase price allocation and period adjustment (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Oct. 16, 2019
May 09, 2019
Dec. 31, 2018
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Goodwill $ 43,892 $ 43,892 $ 43,920     $ 539,469
Period Adjustment            
Goodwill (28)   $ 0      
Cadence13            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Total tangible property 654 654   $ 654    
Operating lease right-of-use asset 62 62   62    
Deferred tax asset 2,928 2,928   2,900    
Goodwill 31,364 31,364   31,392    
Total tangible and other assets 40,331 40,331   40,331    
Operating lease liabilities (985) (985)   (985)    
Net working capital (757) (757)   (757)    
Preliminary fair value of net assets acquired 39,243 39,243   39,243    
Period Adjustment            
Total tangible property   0        
Operating lease right-of-use asset   0        
Deferred tax asset   28        
Goodwill   (28)        
Total tangible and other assets   0        
Operating lease liabilities   0        
Net working capital   0        
Preliminary fair value of net assets acquired   0        
Cadence13 | Trademarks and Trade Names            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Cadence13 brand $ 5,977 5,977   $ 5,977    
Period Adjustment            
Cadence13 brand   $ 0        
2019 Cumulus Exchange            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Total tangible property         $ 844  
Goodwill         2,080  
Preliminary fair value of net assets acquired         $ 22,500