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Summary of Significant Accounting Policies - Summary of Property Plant And Equipment Estimated Useful Lives (Details)
9 Months Ended
Sep. 30, 2021
Computer Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 5 years
Leaseholds and Leasehold Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 5 years