v3.19.3
Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 178,666 $ 226,259
Accumulated Amortization 106,295 100,205
Net $ 72,371 $ 126,054
Domain Names    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Remaining Useful Life - Years 2 years 1 month 6 days 1 year 7 months 6 days
Gross Carrying Amount $ 5,414 $ 5,414
Accumulated Amortization 5,096 4,283
Net 318 $ 1,131
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Remaining Useful Life - Years   1 year 4 months 24 days
Gross Carrying Amount 3,072 $ 5,772
Accumulated Amortization $ 3,072 4,076
Net   $ 1,696
Acquired Developed Technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Remaining Useful Life - Years 3 years 3 months 18 days 3 years 9 months 18 days
Gross Carrying Amount $ 148,298 $ 179,791
Accumulated Amortization 89,189 78,729
Net 59,109 $ 101,062
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Remaining Useful Life - Years   2 years 1 month 6 days
Gross Carrying Amount 2,172 $ 15,572
Accumulated Amortization $ 2,172 8,012
Net   $ 7,560
Patents    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Remaining Useful Life - Years 6 years 2 months 12 days 6 years 10 months 24 days
Gross Carrying Amount $ 19,710 $ 19,710
Accumulated Amortization 6,766 5,105
Net $ 12,944 $ 14,605