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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivatives, Fair Value |  |  |  |
Total stock-based compensation |  |  | $ 1,981 | $ 1,565
Equity Plans |  |  |  |
Derivatives, Fair Value |  |  |  |
Direct operating costs | $ 62 | $ 56 | 126 | 107
Selling and administrative expenses | 957 | 972 | 1,855 | 1,458
Total stock-based compensation | $ 1,019 | $ 1,028 | $ 1,981 | $ 1,565

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