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Stock Options and Restricted Stock Units - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Derivatives, Fair Value |  |  |  |
Total stock-based compensation |  |  | $ 2,026 | $ 1,981
Equity Plans |  |  |  |
Derivatives, Fair Value |  |  |  |
Direct operating costs | $ 73 | $ 62 | 157 | 126
Selling and administrative expenses | 919 | 957 | 1,869 | 1,855
Total stock-based compensation | $ 992 | $ 1,019 | $ 2,026 | $ 1,981

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