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Stockholders' Equity - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 16, 2018
May 01, 2018
Mar. 09, 2018
Mar. 07, 2018
Dec. 29, 2017
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
May 31, 2018
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)             5,000,000 5,000,000  
Preferred stock, par value (usd per share)             $ 0.0001 $ 0.0001  
Preferred stock, shares issued (in shares)             0 0  
Warrants issued (in shares) 11,520,000       316,163        
Proceeds from issuance of preferred stock, preference stock, and warrants             $ 9,647,000 $ 0  
Shares issued upon conversion (in shares) 3,748,184                
Convertible preferred stock converted to other securities $ 7,871,186                
Exercise price (usd per share) $ 2.10       $ 7.42       $ 6.59
Warrant term 5 years       5 years        
Deemed dividend arising from the issuance of common stock to Series A convertible preferred stockholders under most favored nation provision           $ 8,700,000 8,654,000 0  
Increase (decrease) in fair value of warrant liability             $ 491,000 $ 0  
Common stock, shares authorized (in shares)             350,000,000 350,000,000  
Common stock, par value (usd per share)             $ 0.0001 $ 0.0001  
Sale of stock, price per share (in usd per share) $ 2.10                
Common stock warrant, shares to purchase 1                
Exercise price (usd per share) $ 0.0001                
Sale of stock, consideration received on transaction $ 21,600,000                
Purchase Agreement | Private Placement First Closing                  
Class of Stock [Line Items]                  
Warrants issued shares (in shares)     774,186            
Series A Non-voting Convertible | Purchase Agreement                  
Class of Stock [Line Items]                  
Preferred stock, par value (usd per share)       $ 0.0001          
Preferred stock, shares issued (in shares)       10,700          
Warrants issued (in shares)       1,383,631          
Proceeds from issuance of preferred stock, preference stock, and warrants       $ 10,700,000          
Shares issued upon conversion (in shares)       1,844,835          
Conversion price (USD per share)             $ 1.00    
Warrant term       5 years 6 months          
Series A- Convertible Preferred Stock | Private Placement First Closing                  
Class of Stock [Line Items]                  
Deemed dividend on beneficial conversion feature of convertible preferred stock   $ 2,500,000 $ 2,000,000            
Series A- Convertible Preferred Stock | Purchase Agreement                  
Class of Stock [Line Items]                  
Conversion price (USD per share)     $ 5.80 $ 6.59          
Series A- Convertible Preferred Stock | Purchase Agreement | Private Placement First Closing                  
Class of Stock [Line Items]                  
Proceeds from issuance of preferred stock, preference stock, and warrants     $ 6,000,000            
Convertible preferred stock issued shares (in shares)     5,987            
Series A- Convertible Preferred Stock | Purchase Agreement | Private Placement Second Closing                  
Class of Stock [Line Items]                  
Proceeds from issuance of preferred stock, preference stock, and warrants     $ 4,700,000            
Convertible preferred stock issued shares (in shares)     4,713            
Warrants issued shares (in shares)     609,445            
Warrant                  
Class of Stock [Line Items]                  
Shares issued upon conversion (in shares) 3,748,184                
Warrant term 5 years                
Sale of stock, number of shares issued in transaction 4,675,000                
Sale of stock, price per share (in usd per share) $ 2.0999                
Common Stock                  
Class of Stock [Line Items]                  
Warrant term 5 years                
Sale of stock, number of shares issued in transaction 6,845,000