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Stock-Based Compensation Plans - Stock compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-based compensation plans |  |  |  |
Stock compensation expense | $ 4,577 | $ 3,113 | $ 11,875 | $ 8,245
Employee Stock Purchase Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Stock compensation expense | 51 | 77 | 201 | 184
2007 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Stock compensation expense | 9 | 707 | 1,651 | 2,435
2018 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Stock compensation expense | $ 4,517 | $ 2,329 | $ 10,023 | $ 5,626

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