XML 89 R76.htm IDEA: XBRL DOCUMENT v3.10.0.1
Revenue - Composition of Revenue (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]    
Net revenue $ 257,494,599 $ 232,179,463
Commercial Advertising [Member]    
Disaggregation of Revenue [Line Items]    
Net revenue 222,763,906 204,995,073
Digital Advertising [Member]    
Disaggregation of Revenue [Line Items]    
Net revenue 15,485,353 13,339,380
Other [Member]    
Disaggregation of Revenue [Line Items]    
Net revenue $ 19,245,340 $ 13,845,010