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Stock-Based Compensation - Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
General and administrative        
Number of Options        
Stock-based compensation $ 211 $ 180 $ 418 $ 367