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Stock-Based Compensation Plans - Stock compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Stock-based compensation plans |  |
Stock compensation expense | $ 4,629 | $ 2,762
Employee Stock Purchase Plan |  |
Stock-based compensation plans |  |
Stock compensation expense | 22 | 78
2007 Stock Incentive Plan |  |
Stock-based compensation plans |  |
Stock compensation expense | 0 | 685
2021 Stock Incentive Plan |  |
Stock-based compensation plans |  |
Stock compensation expense | $ 4,607 | $ 1,999

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