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Goodwill and Intangible Assets - Finite-lived and Indefinite-lived Intangibe Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in months) 58 months 58 months
Accumulated Amortization $ (37,131) $ (34,664)
Net Carrying Amount 28,475  
Indefinite-lived trade name 3,600 3,600
Foreign currency translation adjustment (523) (398)
Total intangible assets, gross carrying amount 69,206 69,331
Intangible assets, net $ 32,075 $ 34,667
Developed technologies and content library    
Finite Lived Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in months) 66 months 66 months
Gross Carrying Amount $ 43,268 $ 43,268
Accumulated Amortization (20,029) (18,395)
Net Carrying Amount $ 23,239 $ 24,873
Customer lists    
Finite Lived Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in months) 47 months 47 months
Gross Carrying Amount $ 9,970 $ 9,970
Accumulated Amortization (8,540) (8,210)
Net Carrying Amount $ 1,430 $ 1,760
Trade and domain names    
Finite Lived Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in months) 46 months 46 months
Gross Carrying Amount $ 10,873 $ 10,873
Accumulated Amortization (6,648) (6,169)
Net Carrying Amount $ 4,225 $ 4,704
Non-compete agreements    
Finite Lived Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in months) 31 months 31 months
Gross Carrying Amount $ 2,018 $ 2,018
Accumulated Amortization (1,914) (1,890)
Net Carrying Amount $ 104 $ 128