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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stock-Based Compensation |  |  |  |  |  |
Stock-based compensation expense | $ 3,400 |  | $ 3,100 |  | $ 5,800 | $ 4,800
Proceeds from exercise of stock options |  |  |  |  | $ 3,075 | $ 7,282
Common Stock |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Exercise of stock options (in shares) | 72,000 | 268,000 | 343,000 | 540,000 |  |
Common Stock | 2020 Employee stock purchase plan |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Exercise of stock options (in shares) | 300,000 |  | 600,000 |  | 700,000 | 1,200,000
Proceeds from exercise of stock options | $ 1,100 |  | $ 3,300 |  | $ 3,600 | $ 7,800
2000 Stock Plan |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Awards granted (in shares) |  |  |  |  | 0 |
2000 Stock Plan | Stock Options |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Options Expiration period |  |  |  |  | 10 years |

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