Stock incentive plans (Details 2) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
| Recognized stock-based compensation expense | ||||
| Total stock-based compensation | $ 2,256 | $ 1,842 | $ 6,190 | $ 5,210 |
| Stock-based compensation expense capitalized | 177 | 130 | 602 | 291 |
| Network operations | ||||
| Recognized stock-based compensation expense | ||||
| Total stock-based compensation | 336 | 344 | 1,095 | 983 |
| Development and Technology | ||||
| Recognized stock-based compensation expense | ||||
| Total stock-based compensation | 319 | 118 | 546 | 378 |
| Selling and marketing | ||||
| Recognized stock-based compensation expense | ||||
| Total stock-based compensation | 600 | 396 | 1,769 | 1,132 |
| General and administrative | ||||
| Recognized stock-based compensation expense | ||||
| Total stock-based compensation | $ 1,001 | $ 984 | $ 2,780 | $ 2,717 |