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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Stock-Based Compensation |  |
Stock-based compensation expense | $ 2,400 | $ 1,700
Proceeds from exercise of stock options | $ 2,512 | $ 4,499
Common Stock |  |
Stock-Based Compensation |  |
Exercise of stock options (in shares) | 268,000 | 540,000
Common Stock | 2020 Employee stock purchase plan |  |
Stock-Based Compensation |  |
Exercise of stock options (in shares) | 300,000 | 600,000
Proceeds from exercise of stock options | $ 2,500 | $ 4,500
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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