|
Stock incentive plans (Details 2) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Recognized stock-based compensation expense | |||
| Total stock-based compensation | $ 7,164 | $ 4,506 | $ 2,735 |
| Stock-based compensation expense capitalized | 398 | ||
| Network operations | |||
| Recognized stock-based compensation expense | |||
| Total stock-based compensation | 1,356 | 888 | 352 |
| Development and technology | |||
| Recognized stock-based compensation expense | |||
| Total stock-based compensation | 600 | 380 | 352 |
| Selling and marketing | |||
| Recognized stock-based compensation expense | |||
| Total stock-based compensation | 2,017 | 1,045 | 571 |
| General and administrative | |||
| Recognized stock-based compensation expense | |||
| Total stock-based compensation | $ 3,191 | $ 2,193 | $ 1,460 |