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Summary of Significant Accounting Policies - Antidilutive Shares (Details) - shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities    
Ant-dilutive shares (in shares) 6,339,120 4,643,896
Unvested restricted incentive shares and units    
Antidilutive Securities    
Ant-dilutive shares (in shares) 589,276 412,797
Share options    
Antidilutive Securities    
Ant-dilutive shares (in shares) 5,749,844 4,231,099