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Subsequent Events - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Jul. 01, 2020
Jul. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]                
Common stock, shares outstanding     3,166,946   3,166,946      
Common stock, shares authorized     1,519,618,271   1,519,618,271      
Convertible preferred stock, shares authorized     21,461,756   11,567,003      
Convertible Preferred Stock                
Subsequent Event [Line Items]                
Convertible preferred stock, shares outstanding     21,369,774 21,369,774 10,313,808 10,313,808 9,297,081 9,297,081
Initial Public Offering | Common Stock                
Subsequent Event [Line Items]                
Net proceeds from initial public offering     $ 172.7          
Subsequent Event                
Subsequent Event [Line Items]                
Common stock, shares authorized   1,000,000,000            
Subsequent Event | Convertible Preferred Stock                
Subsequent Event [Line Items]                
Convertible preferred stock, shares outstanding   21,369,774            
Temporary equity accrued cumulative dividends shares   2,564,759            
Subsequent Event | Undesignated Preferred Stock                
Subsequent Event [Line Items]                
Convertible preferred stock, shares authorized   100,000,000            
Subsequent Event | Common Stock                
Subsequent Event [Line Items]                
Conversion of stock shares issued   23,934,533            
Subsequent Event | Initial Public Offering                
Subsequent Event [Line Items]                
Common stock, shares outstanding   36,876,479            
Subsequent Event | Initial Public Offering | Common Stock                
Subsequent Event [Line Items]                
Shares of common stock issued   9,775,000            
Offering price per share   $ 19.00            
Net proceeds from initial public offering   $ 172.7            
Underwriting discounts and commissions   $ 13.0            
Subsequent Event | Over-Allotment Option | Common Stock                
Subsequent Event [Line Items]                
Shares of common stock issued   1,275,000            
Subsequent Event | Tallac Services Agreement                
Subsequent Event [Line Items]                
Percentage of service fee based costs incurred 10.00%              
Services agreements, initial term 4 years              
Services agreement automatically renewed 1 year              
Subsequent Event | Dr. Wan Consulting Agreement                
Subsequent Event [Line Items]                
Percentage of time performing activities 20.00%              
Consulting agreements, initial term 4 years              
Consulting agreement automatically renewed 4 years              
Subsequent Event | Asset Transfer Agreement                
Subsequent Event [Line Items]                
Sale of lab equipment and other assets $ 0.6              
Cash in exchange for transfer of assets   $ 0.6