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Stockholders' Equity - Narrative - Restricted Stock Awards and Stock Option Grants (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Award vesting period | 4 years |  |
Restricted Stock Awards |  |  |
Class of Stock [Line Items] |  |  |
Compensation not yet recognized, share-based awards other than options | $ 9.0 | $ 7.1 |
Compensation cost not yet recognized, period for recognition | 1 year 8 months 26 days | 1 year 8 months 4 days |
Award vesting period | 4 years |  |
Performance Restricted Stock Units |  |  |
Class of Stock [Line Items] |  |  |
Compensation not yet recognized, share-based awards other than options | $ 1.1 | $ 1.0 |
Compensation cost not yet recognized, period for recognition | 1 year 9 months 3 days | 1 year 9 months |
Award vesting period | 3 years |  |
Stock Option Awards |  |  |
Class of Stock [Line Items] |  |  |
Compensation cost not yet recognized, period for recognition | 1 year 9 months 3 days | 1 year 8 months 4 days |
Weighted average grant price (in dollars per share) | $ 7.72 | $ 6.30 | $ 5.98
Total unrecognized compensation costs related to stock option awards | $ 3.8 | $ 2.8 |

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