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Research Collaboration and License Agreements - Summary of Contract Liabilities (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Revenue From Contract With Customer [Abstract]    
Contract liabilities $ 37,013,663 $ 45,089,094
Amounts included in deferred revenue in previous periods $ 11,075,430 $ 18,651,649