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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Stock-Based Compensation |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 3,600 |  |  | $ 3,200 |  |  | $ 9,800 | $ 9,000
Proceeds from exercise of stock options |  |  |  |  |  |  |  | $ 1,156 | $ 3,419
Common Stock |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 30,000 | 25,000 | 41,000 | 34,000 | 72,000 | 268,000 |  |
Common Stock | Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) | 40,000.0 | 38,000.0 |  |  |  |  |  | 400,000 | 700,000
Proceeds from exercise of stock options |  | $ 400 |  |  | $ 300 |  |  | $ 1,900 | $ 3,900

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