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Revenue Recognition (Tables)
9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Revenue from contracts
  

Three Months Ended

September 30,

 

Nine Months Ended

September 30,

   2018  2017  2018  2017
   (in thousands)
Lead fees  $24,986   $27,711   $71,277   $83,149 
Advertising                    
Clicks   5,559    7,436    18,020    20,403 
Display and other advertising   1,047    1,510    3,623    4,511 
Other revenues   103    215    416    741 
   Total revenue  $31,695   $36,872   $93,336   $108,804