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Equity Plans - Performance Stock Units (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Equity Plans |  |
Stock-based compensation | $ 5,935,000 | $ 2,660,000
Performance Stock Units |  |
Equity Plans |  |
Vesting percentage of requisite service period |  | 100.00%
Fair value of stock units | 2,500,000 |
Stock-based compensation | $ 0 |

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