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Debt Financing and Revolving Credit Facilities (Fair Value of Warrant) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Debt Disclosure [Abstract]              
Warrant liability     $ 12,730   $ 12,730 $ 12,730  
Change in fair value $ 293 $ (3,452) $ 22,128 $ 0 $ 18,676 18,969 $ 0
Warrant liability $ 31,699         $ 31,699