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Stock-Based Compensation - Summary of Stock Options Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Weighted-Average Exercise Price Per Share    
Intrinsic value, exercised   $ 0
Options to purchase Common Stock    
Number of Options    
Beginning balance (in shares) 1,015,418  
Granted (in shares) 969,965  
Exercised (in shares) (60,195)  
Forfeitures (in shares) (48,537)  
Expired (in shares) (16,144)  
Ending balance (in shares) 1,860,507 1,015,418
Vested and exercisable (in shares) 753,206  
Vested and expected to vest (in shares) 1,777,407  
Weighted-Average Exercise Price Per Share    
Outstanding (in dollars per share) $ 12.77  
Granted (in dollars per share) 2.53  
Exercised (in dollars per share) 2.46  
Forfeited (in dollars per share) 22.91  
Expired (in dollars per share) 21.29  
Outstanding (in dollars per share) 7.43 $ 12.77
Vested and exercisable (in dollars per share) 14.63  
Vested and expected to vest (in dollars per share) $ 7.65  
Intrinsic value, outstanding $ 27,963,363 $ 0
Intrinsic value, exercised 970,145  
Intrinsic value, vested and exercisable 10,837,211  
Intrinsic value, vested and expected to vest $ 26,682,849  
Weighted average remaining contract term, outstanding 8 years 10 months 24 days 9 years 1 month 6 days
Weighted average remaining contractual term, exercisable 8 years 6 months  
Weighted average remaining contractual term, vested and expected to vest 8 years 10 months 24 days