v3.5.0.2
Stock-Based Compensation (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2016
$ / shares
shares
Sep. 30, 2016
USD ($)
item
$ / shares
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
item
$ / shares
shares
Sep. 30, 2015
USD ($)
Dec. 31, 2015
$ / shares
shares
Jan. 01, 2016
shares
Jan. 01, 2015
shares
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Number of share-based employee compensation plans | item   2   2        
Common stock reserved for issuance   9,440,315   9,440,315        
Stock-based compensation expense | $   $ 4,073 $ 3,302 $ 11,593 $ 9,217      
Servicing and support                
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Stock-based compensation expense | $   825 642 2,399 1,637      
Technology and content development                
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Stock-based compensation expense | $   633 442 1,739 1,100      
Program marketing and sales                
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Stock-based compensation expense | $   360 282 973 741      
General and administrative                
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Stock-based compensation expense | $   $ 2,255 $ 1,936 $ 6,482 $ 5,739      
Stock options                
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Option to purchase common stock, outstanding   4,943,556   4,943,556   5,298,510    
Weighted average exercise price | $ / shares   $ 10.43   $ 10.43   $ 8.07    
Granted (in shares)       721,200        
Restricted Stock Units                
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Number of restricted stock units granted (in shares)       686,344        
Equity Incentive Plan 2014                
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Period of annual automatic increase in the number of shares authorized           10 years    
Percentage applied on total number of shares of common stock outstanding on previous calendar year for automatic inclusion in the plan           5.00%    
Common stock reserved for issuance             2,288,820 2,036,503
Equity Incentive Plan 2014 | Stock options                
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Exercise price (in dollars per share) | $ / shares $ 38.29              
Number of restricted stock units granted (in shares) 37,347              
Equity Incentive Plan 2014 | Restricted Stock Units                
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                
Number of restricted stock units granted (in shares) 15,324