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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation Of Revenue [Line Items]    
Total net revenues $ 9,743 $ 11,785
Radio Advertising    
Disaggregation Of Revenue [Line Items]    
Total net revenues $ 4,955 $ 6,380
Radio Advertising | Revenue, Product and Service Benchmark | Product Concentration Risk    
Disaggregation Of Revenue [Line Items]    
Percentage of revenue 50.90% 54.10%
Outdoor Advertising    
Disaggregation Of Revenue [Line Items]    
Total net revenues [1] $ 2,972 $ 3,267
Outdoor Advertising | Revenue, Product and Service Benchmark | Product Concentration Risk    
Disaggregation Of Revenue [Line Items]    
Percentage of revenue [1] 30.50% 27.70%
Nontraditional    
Disaggregation Of Revenue [Line Items]    
Total net revenues $ 137 $ 168
Nontraditional | Revenue, Product and Service Benchmark | Product Concentration Risk    
Disaggregation Of Revenue [Line Items]    
Percentage of revenue 1.40% 1.40%
Digital    
Disaggregation Of Revenue [Line Items]    
Total net revenues $ 485 $ 674
Digital | Revenue, Product and Service Benchmark | Product Concentration Risk    
Disaggregation Of Revenue [Line Items]    
Percentage of revenue 5.00% 5.70%
Other    
Disaggregation Of Revenue [Line Items]    
Total net revenues $ 1,194 $ 1,296
Other | Revenue, Product and Service Benchmark | Product Concentration Risk    
Disaggregation Of Revenue [Line Items]    
Percentage of revenue 12.20% 11.10%
[1] A substantial portion of this revenue is from lessor revenue derived from operating leases accounted for under ASC 842, “Leases.”