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Description of Business and Summary of Significant Accounting Policies - Stock-based compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Description of Business and Summary of Significant Accounting Policies
Direct operating costs	$ 158	$ 113
Selling and adminstrative expenses	755	723
Total stock-based compensation	$ 913	$ 836

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

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