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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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Amount of selling, general and administrative expense classified as other.

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Amount of noncash expense for share-based payment arrangement.

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Amount of noncash expense for option under share-based payment arrangement.

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