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Summary of Significant Accounting Policies - Accounts Receivable, Unbilled Services, and Deferred Revenue and Allowance for Doubtful Accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Jun. 30, 2021
Dec. 31, 2019
Accounting Policy [Line Items]      
Allowances for doubtful accounts $ 0 $ 125,425 $ 0
Minimum      
Accounting Policy [Line Items]      
Payment terms 30 days    
Maximum      
Accounting Policy [Line Items]      
Payment terms 90 days