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Summary of Significant Accounting Policies - Leases (Details) - USD ($)
12 Months Ended
Aug. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating leases liabilities, current portion     $ 337,000
Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Monthly base rents   $ 38,000  
Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Monthly base rents   41,000  
Office space sub lease      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease - right-of-use asset   0  
Operating leases liabilities, current portion   $ 0  
Sub lease rent $ 15,000