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Net Loss per Share Attributable to Common Stockholders - Anti-dilutive effect (Details) - shares
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Antidilutive Securities    
Antidilutive securities excluded from computation of diluted net loss per share 5,276,833 4,544,382
Option to purchase common stock    
Antidilutive Securities    
Antidilutive securities excluded from computation of diluted net loss per share 5,276,833 4,544,382