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The Company and Nature of Business (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 16, 2018
USD ($)
$ / shares
shares
Oct. 04, 2018
Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]      
Reverse stock split ratio   0.0556 0.0556
Common stock issued upon conversion of redeemable convertible preferred stock (in shares) 12,066,654    
Adjustments to additional paid-in capital related to warrants | $ $ 1.2    
IPO      
Subsidiary, Sale of Stock [Line Items]      
Number of shares issued in IPO (in shares) 8,280,000    
IPO share price (in dollars per share) | $ / shares $ 15.00    
Net proceeds from IPO | $ $ 113.4    
Common Stock      
Subsidiary, Sale of Stock [Line Items]      
Warrants to purchase shares of stock (in shares) 160,657    
Preferred Stock Warrants | Redeemable Convertible Preferred Stock      
Subsidiary, Sale of Stock [Line Items]      
Number of warrants converted (in shares) 156,550