v3.5.0.2
Stock incentive plans - Compensation expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Recognized stock-based compensation expense        
Total stock-based compensation $ 3,079 $ 2,099 $ 6,684 $ 3,934
Stock-based compensation expense capitalized 189 209 371 425
Network operations        
Recognized stock-based compensation expense        
Total stock-based compensation 531 412 1,177 759
Development and Technology        
Recognized stock-based compensation expense        
Total stock-based compensation 251 129 563 227
Selling and marketing        
Recognized stock-based compensation expense        
Total stock-based compensation 458 642 1,007 1,169
General and administrative        
Recognized stock-based compensation expense        
Total stock-based compensation $ 1,839 $ 916 $ 3,937 $ 1,779