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Share-based Compensation - Summary of Nonvested Restricted Common Stock Activity (Details) - Nonvested Restricted Common Stock [Member]
9 Months Ended
Sep. 30, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding, beginning balance 1,184,252
Shares granted 1,589,622
Shares vested (365,520)
Outstanding, ending balance 2,408,354