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Revenue - Summary of Revenue Disaggregated by Sales Channel and Major Products and Services (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]                      
Total revenue $ 152,187 $ 152,090 $ 148,207 $ 154,198 $ 164,346 $ 169,312 $ 168,512 $ 159,957 $ 606,682 $ 662,127 $ 626,262
Direct                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 477,095 457,651 333,248
National Advertising                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 80,774 105,381 114,178
Other                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 14,442 16,156 15,854
Retail                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 572,311 579,188 463,280
Wholesale                      
Disaggregation Of Revenue [Line Items]                      
Total revenue [1]                 34,371 82,939 162,982
Marketplace Subscription Advertising                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 475,960 507,993 483,026
Display Advertising                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 91,935 112,792 102,183
Pay Per Lead                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 26,907 30,757 31,727
Other                      
Disaggregation Of Revenue [Line Items]                      
Total revenue                 $ 11,880 $ 10,585 $ 9,326
[1] For information related to related party transactions, see Note 16 (Related Party).