Revenue - Summary of Revenue Disaggregated by Sales Channel and Major Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 148,094	$ 154,198
Direct
Disaggregation Of Revenue [Line Items]
Total revenue	125,361	115,094
National Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	19,393	20,295
Other
Disaggregation Of Revenue [Line Items]
Total revenue	3,340	3,949
Retail
Disaggregation Of Revenue [Line Items]
Total revenue	148,094	139,338
Wholesale
Disaggregation Of Revenue [Line Items]
Total revenue	0	14,860
Subscription Advertising and Digital Solutions
Disaggregation Of Revenue [Line Items]
Total revenue	117,263	121,314
Display Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	23,359	22,289
Pay Per Lead
Disaggregation Of Revenue [Line Items]
Total revenue	5,743	7,934
Other
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,729	$ 2,661