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Share-Based Compensation - Summary of Stock Option Activity (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Options    
Options outstanding, Beginning balance | shares 2,920,500  
Options granted | shares 560,000  
Options exercised | shares (13,594)  
Options forfeited | shares (160,250)  
Options outstanding, Ending balance | shares 3,306,656 2,920,500
Options exercisable | shares 696,461  
Options vested and expected to vest | shares 3,119,588  
Weighted average exercise price    
Weighted average exercise price, Outstanding beginning balance | $ / shares $ 10.40  
Weighted average exercise price, Options granted | $ / shares 15.65  
Weighted average exercise price, Options exercised | $ / shares 12.00  
Weighted average exercise price, Options forfeited | $ / shares 10.76  
Weighted average exercise price, Outstanding ending balance | $ / shares 11.26 $ 10.40
Weighted average exercise price, Options exercisable | $ / shares 11.97  
Weighted average exercise price, Options vested and expected to vest | $ / shares $ 11.24  
Weighted average remaining contractual term (years)    
Weighted average remaining contractual term, Options outstanding 9 years 1 month 6 days 9 years 7 months 6 days
Weighted average remaining contractual term, Options exercisable 8 years 8 months 12 days  
Weighted average remaining contractual term, Options vested and expected to vest 9 years 1 month 6 days  
Aggregate intrinsic value, Outstanding, Beginning balance | $ $ 18,548,215 $ 1,932,000
Aggregate intrinsic value, Options exercisable | $ 3,416,065  
Aggregate intrinsic value, Options vested and expected to vest | $ $ 17,576,131