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Stock Options - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Stock Options |  |  |  |
Direct operating costs | $ 34 | $ 62 | $ 72 | $ 171
Selling and administrative expenses | 317 | 206 | 552 | 368
Total stock-based compensation | $ 351 | $ 268 | $ 624 | $ 539

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