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Stock-Based Compensation Plans - Stock compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stock-based compensation plans |  |  |  |
Stock compensation expense | $ 3,113 | $ 2,201 | $ 8,245 | $ 5,588
Employee Stock Purchase Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Stock compensation expense | 77 | 31 | 184 | 41
2007 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Stock compensation expense | 707 | 1,099 | 2,435 | 3,501
2018 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Stock compensation expense | $ 2,329 | $ 1,071 | $ 5,626 | $ 2,046

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