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Stock-Based Compensation - Summary of Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Service-Based RSUs |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation | $ 588 | $ 580 | $ 2,013 | $ 1,939
Performance-Based RSUs |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation | 383 | 472 | 1,942 | 123
Cash Settled Awards |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation | 16 | 67 | 151 | 102
RSUs |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation | 987 | 1,119 | 4,106 | 2,164
Income tax benefit | 227 | 257 | 945 | 497
Net expense | $ 760 | $ 862 | $ 3,161 | $ 1,667

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