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Redeemable Convertible Preferred Stock and Stockholders’ Equity - Common and Preferred Stock (Details)
 3 Months Ended
Jan. 31, 2020
Vote
item
$ / shares
shares
Jan. 28, 2020
shares
Mar. 31, 2020
shares
Jun. 30, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Redeemable Convertible Preferred Stock and Stockholders’ Equity          
Number of classes of stock designated | item 2        
Number of common and preferred shares authorized 37,000,000        
Common stock, par value (dollars per share) | $ / shares $ 0.0001     $ 0.0001 $ 0.0001
Preferred stock, par value (dollars per share) | $ / shares $ 0.0001     $ 0.0001 $ 0.0001
Number of common shares authorized 35,000,000     35,000,000 10,150,000
Number of preferred shares authorized 2,000,000     2,000,000 0
Number of vote for each share of common stock | Vote 1        
Series A Redeemable convertible preferred stock          
Redeemable Convertible Preferred Stock and Stockholders’ Equity          
Conversion of redeemable convertible preferred stock to common stock, shares 5,133,159        
Conversion price | $ / shares $ 1.26        
Series A Redeemable convertible preferred stock | IPO          
Redeemable Convertible Preferred Stock and Stockholders’ Equity          
Conversion of redeemable convertible preferred stock to common stock, shares     5,133,159    
Series A-1 Redeemable convertible preferred stock          
Redeemable Convertible Preferred Stock and Stockholders’ Equity          
Conversion of redeemable convertible preferred stock to common stock, shares 630,722        
Conversion price | $ / shares $ 0.70        
Series A-1 Redeemable convertible preferred stock | IPO          
Redeemable Convertible Preferred Stock and Stockholders’ Equity          
Conversion of redeemable convertible preferred stock to common stock, shares     630,722    
Common Stock | IPO and Over-Allotment Option          
Redeemable Convertible Preferred Stock and Stockholders’ Equity          
Issuance of common stock 2,300,000        
Common Stock | IPO          
Redeemable Convertible Preferred Stock and Stockholders’ Equity          
Issuance of common stock   2,000,000 2,300,000    
Number of shares issued for the conversion of redeemable convertible preferred stock 4,117,089   4,117,089