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Fair Value of Financial Instruments - Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Level 2    
Liabilities, Fair Value Disclosure [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure   $ 0
Level 3    
Liabilities, Fair Value Disclosure [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0