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Stock Options and Restricted Stock Units - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivatives, Fair Value        
Total stock-based compensation     $ 1,981 $ 1,565
Equity Plans        
Derivatives, Fair Value        
Direct operating costs $ 62 $ 56 126 107
Selling and administrative expenses 957 972 1,855 1,458
Total stock-based compensation $ 1,019 $ 1,028 $ 1,981 $ 1,565