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Share-Based Compensation - Stock options activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-Based Compensation      
Number of shares available for grant 363,095 1,861,856  
Stock options      
Balance at the beginning 3,209,063    
Balance at the end 5,031,310 3,209,063  
Vested and exercisable as of December 31, 2021 463,816 1,375  
Weighted Average Remaining Contractual Life (in years)      
Outstanding 9 years 2 months 12 days    
Vested and exercisable as of ending of year 8 years 3 months 18 days    
Aggregate intrinsic value      
Outstanding $ 120,491,000 $ 16,094,000 $ 2,817,000
Vested and exercisable as of ending of year $ 36,579,000    
Weighted-average grant date fair value of stock options granted $ 4,034 $ 3,701  
Share-based compensation expense $ 0    
Future share-based compensation for unvested stock options $ 19,628,000    
Weighted-average Period 2 years 9 months    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 14,161,000 $ 1,030,000  
2018 Equity Incentive Plan      
Share-Based Compensation      
Number of shares authorized 8,209,568 6,672,721  
Number of shares available for grant 363,095 1,861,856  
Stock options      
Share-Based Compensation      
Vesting period (in years) 4 years    
Vesting expiration period 10 years    
Aggregate intrinsic value      
Weighted-average grant date fair value of stock options granted $ 9.05 $ 2.54  
Share-based compensation expense $ 6,433,000 $ 3,558,000  
Stock options | 2018 Equity Incentive Plan      
Stock options      
Balance at the beginning 3,209,063 1,081,579  
Granted 3,457,020 3,251,443  
Exercised (1,247,236) (307,778)  
Cancelled/Forfeited/Expired (387,537) (816,181)  
Balance at the end 5,031,310 3,209,063 1,081,579
Vested and exercisable as of December 31, 2021 1,284,624    
Weighted Average Exercise Price      
Weighted Average Exercise Price $ 2.33    
Balance at the beginning 1.57 $ 2.31  
Balance at the end 6.85 1.57 $ 2.31
Granted 9.37 2.60  
Exercised 1.68 1.56  
Cancelled/Forfeited/Expired 2.00 $ 2.03  
Vested and exercisable as of December 31, 2021 $ 2.33    
Weighted Average Remaining Contractual Life (in years)      
Outstanding   9 years 1 month 6 days 8 years 10 months 24 days
Restricted Stock Awards      
Share-Based Compensation      
Vesting period (in years) 4 years    
Aggregate intrinsic value      
Weighted-average grant date fair value of stock options granted $ 1.78 $ 1.69  
Share-based compensation expense $ 890,000 $ 915,000  
Weighted-average Period 4 months 28 days