v3.8.0.1
Goodwill and Amortizable Intangible Assets - Amortizable Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Goodwill and Amortizable Intangible Assets    
Balance as of December 31, 2017 $ 71,988  
Foreign currency translation adjustments 3,308  
Balance as of March 31, 2018 75,296  
Gross Carrying Amount 153,301 $ 124,542
Accumulated Amortization (38,605) (33,781)
Net Carrying Amount $ 114,696 90,761
Capitalized technology    
Goodwill and Amortizable Intangible Assets    
Estimated Average Useful Life (in years) 3 years  
Gross Carrying Amount $ 43,569 27,108
Accumulated Amortization (10,820) (9,486)
Net Carrying Amount $ 32,749 17,622
Capitalized content development    
Goodwill and Amortizable Intangible Assets    
Estimated Average Useful Life (in years) 4 years  
Gross Carrying Amount $ 60,815 55,872
Accumulated Amortization (23,525) (21,417)
Net Carrying Amount $ 37,290 34,455
University client relationships    
Goodwill and Amortizable Intangible Assets    
Estimated Average Useful Life (in years) 9 years  
Gross Carrying Amount $ 30,692 29,443
Accumulated Amortization (2,558) (1,636)
Net Carrying Amount $ 28,134 27,807
Trade names and domain names    
Goodwill and Amortizable Intangible Assets    
Estimated Average Useful Life (in years) 10 years  
Gross Carrying Amount $ 18,225 12,119
Accumulated Amortization (1,702) (1,242)
Net Carrying Amount 16,523 10,877
In process capitalized technology and content development    
Goodwill and Amortizable Intangible Assets    
Net Carrying Amount 29,500 $ 15,600
Short Course Segment    
Goodwill and Amortizable Intangible Assets    
Balance as of December 31, 2017 71,988  
Foreign currency translation adjustments 3,308  
Balance as of March 31, 2018 $ 75,296