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The Company and Liquidity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jan. 30, 2020
Feb. 07, 2019
Mar. 31, 2020
Mar. 31, 2019
Common Stock        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Public offerings     9,602,500 9,739,541
Initial Public Offering        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Public offerings   9,739,541    
Share price   $ 19.00    
Proceeds from issuance of common stock, net of underwriting discounts and commissions and offering expenses   $ 168.2    
Convertible preferred stock, shares outstanding   0    
Initial Public Offering | Common Stock        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Conversion of convertible preferred stock to common stock   45,374,836    
Over-Allotment Option        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Public offerings 1,252,500 489,541    
Follow-on-offering        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Public offerings 9,602,500      
Share price $ 25.00      
Proceeds from issuance of common stock, net of underwriting discounts and commissions and offering expenses $ 224.5