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Intangible Assets (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Estimated amortization expense    
October 1, 2021 through December 31, 2021 $ 452  
2022 1,619  
2023 1,629  
2024 1,640  
2025 1,443  
2026 611  
2027 and thereafter 1,337  
Net $ 8,731 $ 10,708