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Debt Obligations - Line of Credit (Details) - Line of Credit - USD ($)
Sep. 30, 2021
Mar. 23, 2021
Mar. 22, 2021
Dec. 31, 2020
Sep. 30, 2018
Sep. 30, 2013
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 5,000,000 $ 10,000,000
Minimum cash balance required   $ 6,000,000 $ 5,000,000      
Line of credit $ 0     $ 0