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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Stock-Based Compensation |  |  |  |  |  |
Stock-based compensation expense | $ 3,100 |  | $ 2,300 |  | $ 4,800 | $ 4,000
Proceeds from exercise of stock options |  |  |  |  | $ 7,282 | $ 2,396
Common Stock |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Exercise of stock options (in shares) | 343,000 | 540,000 | 104,000 | 288,000 |  |
Common Stock | Employee stock purchase plan |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Exercise of stock options (in shares) | 600,000 |  | 300,000 |  | 1,200,000 | 600,000
Proceeds from exercise of stock options | $ 3,300 |  | $ 1,000 |  | $ 7,800 | $ 2,800
2000 Stock Plan |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Number of shares of common stock available for future grants | 0 |  |  |  | 0 |
Options Expiration period |  |  |  |  | 10 years |

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