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The Company and Nature of Business (Details)
$ / shares in Units, $ in Millions
1 Months Ended
Oct. 16, 2018
USD ($)
$ / shares
shares
Oct. 31, 2018
Sep. 30, 2018
shares
Dec. 31, 2017
shares
Subsidiary, Sale of Stock [Line Items]        
Warrants to purchase shares of stock (in shares)     280,876 280,876
Redeemable Convertible Preferred Stock        
Subsidiary, Sale of Stock [Line Items]        
Warrants to purchase shares of stock (in shares)     156,550 156,550
Common Stock        
Subsidiary, Sale of Stock [Line Items]        
Warrants to purchase shares of stock (in shares)     124,326 124,326
Preferred Stock Warrants | Redeemable Convertible Preferred Stock        
Subsidiary, Sale of Stock [Line Items]        
Warrants to purchase shares of stock (in shares)     156,550 156,550
Subsequent Event        
Subsidiary, Sale of Stock [Line Items]        
Reverse stock split ratio   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 | $ $ 1.1      
Subsequent Event | 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 | $ $ 113.7      
Subsequent Event | Common Stock        
Subsidiary, Sale of Stock [Line Items]        
Warrants to purchase shares of stock (in shares) 284,983      
Subsequent Event | Preferred Stock Warrants | Redeemable Convertible Preferred Stock        
Subsidiary, Sale of Stock [Line Items]        
Number of warrants converted (in shares) 156,550