v3.10.0.1
Goodwill and Amortizable Intangible Assets - Amortizable Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Goodwill and Amortizable Intangible Assets    
Balance as of December 31, 2017 $ 71,988  
Foreign currency translation adjustments (7,115)  
Balance as of June 30, 2018 64,873  
Gross Carrying Amount 169,327 $ 124,542
Accumulated Amortization (43,265) (33,781)
Net Carrying Amount $ 126,062 90,761
Capitalized technology    
Goodwill and Amortizable Intangible Assets    
Estimated Average Useful Life (in years) 3 years  
Gross Carrying Amount $ 59,549 27,108
Accumulated Amortization (12,269) (9,486)
Net Carrying Amount 47,280 17,622
Capitalized content development    
Goodwill and Amortizable Intangible Assets    
Gross Carrying Amount 65,981 55,872
Accumulated Amortization (25,988) (21,417)
Net Carrying Amount $ 39,993 34,455
Capitalized content development | Minimum    
Goodwill and Amortizable Intangible Assets    
Estimated Average Useful Life (in years) 4 years  
Capitalized content development | Maximum    
Goodwill and Amortizable Intangible Assets    
Estimated Average Useful Life (in years) 5 years  
University client relationships    
Goodwill and Amortizable Intangible Assets    
Estimated Average Useful Life (in years) 9 years  
Gross Carrying Amount $ 26,757 29,443
Accumulated Amortization (2,973) (1,636)
Net Carrying Amount $ 23,784 27,807
Trade names and domain names    
Goodwill and Amortizable Intangible Assets    
Estimated Average Useful Life (in years) 10 years  
Gross Carrying Amount $ 17,040 12,119
Accumulated Amortization (2,035) (1,242)
Net Carrying Amount 15,005 10,877
In process capitalized technology and content development    
Goodwill and Amortizable Intangible Assets    
Net Carrying Amount 30,600 $ 15,600
Short Course Segment    
Goodwill and Amortizable Intangible Assets    
Balance as of December 31, 2017 71,988  
Foreign currency translation adjustments (7,115)  
Balance as of June 30, 2018 $ 64,873