v3.10.0.1

Stock incentive plans - Compensation expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Recognized stock-based compensation expense |  |  |
Total stock-based compensation expense | $ 12,268 | $ 14,215 | $ 12,805
Stock-based compensation expense capitalized | 789 | 696 | 727
Network operations |  |  |
Recognized stock-based compensation expense |  |  |
Total stock-based compensation expense | 2,070 | 2,174 | 2,144
Development and technology |  |  |
Recognized stock-based compensation expense |  |  |
Total stock-based compensation expense | 1,242 | 1,068 | 1,070
Selling and marketing |  |  |
Recognized stock-based compensation expense |  |  |
Total stock-based compensation expense | 1,868 | 2,060 | 1,842
General and administrative |  |  |
Recognized stock-based compensation expense |  |  |
Total stock-based compensation expense | $ 7,088 | $ 8,913 | $ 7,749

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