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Stock-Based Compensation - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock options shares outstanding 8,932,214   6,945,184  
Common stock, shares issued 59,564,659   56,259,747  
Aggregate intrinsic value of exercised stock options $ 720,000      
Expected term   6 years    
Payments of dividends of common stock $ 0      
Expected dividend yield 0.00% 0.00%    
Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term 6 years      
Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term 5 years 3 months 18 days      
ESPP        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term 6 months      
Employee options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unrecognized stock-based compensation cost $ 33,900,000      
Estimated weighted average amortization period 2 years 10 months 24 days      
2018 Equity Incentive Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock options shares outstanding 7,335,156      
Shares available for future issuance 1,434,652      
Number of shares will increase automatically through every year on specified date --01-01      
Number of shares increase automatically continuing through maximum period beginning on January 1, 2019 and continuing through and including January 1, 2028      
Weighted average grant date fair value of options granted $ 10.46      
2018 Equity Incentive Plan | Common Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Maximum number of shares authorized available for issuance 1,600,692      
Increase in number of shares reserved for issuance as percentage of total number of shares of capital stock outstanding on last date of preceding calendar year 5.00%      
2018 Equity Incentive Plan | Maximum | Common Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Maximum number of shares authorized available for issuance 4,000,000      
2018 Equity Incentive Plan | Incentive Stock Options | Maximum | Common Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Maximum number of shares issued upon exercise of incentive stock options 12,500,000      
2018 Equity Incentive Plan | RSU Member        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
option grant vesting period 3 years      
2015 Equity Incentive Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
option grant vesting period 4 years      
Options to purchase of common stock outstanding 1,597,058      
2015 Equity Incentive Plan | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options granted expiry period 10 years      
2018 Employee Stock Purchase Plan | Common Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares available for future issuance 1,086,992     200,000
Common stock, shares issued 246,232      
Authorized an offering beginning period Nov. 16, 2018      
Authorized an offering ending period May 15, 2019      
Authorized an additional offering beginning period Nov. 16, 2021      
2018 Employee Stock Purchase Plan | Maximum | Common Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage of annual increase in number of common stock shares 1.00%      
Annual increase in number of common stock shares 375,000      
Option price per share of common stock at fair market value 85.00%