Stock incentive plans (Details 2) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Recognized stock-based compensation expense | ||
| Total stock-based compensation | $ 3,605 | $ 1,835 |
| Stock-based compensation expense capitalized | 182 | 216 |
| Network operations | ||
| Recognized stock-based compensation expense | ||
| Total stock-based compensation | 646 | 347 |
| Development and Technology | ||
| Recognized stock-based compensation expense | ||
| Total stock-based compensation | 312 | 98 |
| Selling and marketing | ||
| Recognized stock-based compensation expense | ||
| Total stock-based compensation | 549 | 527 |
| General and administrative | ||
| Recognized stock-based compensation expense | ||
| Total stock-based compensation | $ 2,098 | $ 863 |