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Stock Options - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stock Options |  |  |  |
Direct operating costs | $ 40 | $ 34 | $ 119 | $ 72
Selling and administrative expenses | 192 | 317 | 581 | 552
Total stock-based compensation | $ 232 | $ 351 | $ 700 | $ 624

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