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Stock Options and Restricted Shares - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock Options and Restricted Shares |  |  |  |
Direct operating costs | $ 21 | $ 40 | $ 96 | $ 119
Selling and administrative expenses | 482 | 192 | 1,021 | 581
Total stock-based compensation | $ 503 | $ 232 | $ 1,117 | $ 700

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- Definition Amount of noncash expense for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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