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Stock-Based Compensation Expense - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated share-based compensation | $ 4,857 | $ 4,063 | $ 11,589 | $ 10,268
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options granted in period (in shares) | 530,500 | 112,500 | 656,350 | 328,994
Compensation cost not yet recognized | $ 29,400 |  | $ 29,400 |
Compensation cost not yet recognized, period of recognition |  |  | 2 years 8 months 12 days |
Stock-Settled Performance-Based Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 1 year |
Compensation cost not yet recognized | 5,900 |  | $ 5,900 |
Compensation cost not yet recognized, period of recognition |  |  | 1 year 9 months 18 days |
Stock-Settled Performance-Based Restricted Stock Units | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units granted in period (in shares) |  |  | 128,883 | 127,060
Cash-settled performance-based share-based awards ("Liability Awards") |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target cash incentive | 1,000 | $ 1,000 | $ 1,000 | $ 1,000
Compensation cost not yet recognized | 2,100 |  | $ 2,100 |
Compensation cost not yet recognized, period of recognition |  |  | 1 year 9 months 18 days |
Restricted Stock Units | Non-employee members |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period |  |  | 1 year |
Compensation cost not yet recognized | $ 1,200 |  | $ 1,200 |
Compensation cost not yet recognized, period of recognition |  |  | 8 months 12 days |
Restricted stock units granted (in shares) | 26,226 | 33,504 |  |

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