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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