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Stock Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]        
Expected to be recognized as compensation expense $ 308,000 $ 21,000 $ 415,000 $ 53,000
Unrecognized compensation expense $ 34,100,000   $ 34,100,000