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Stockholders' Equity - Warrants Narrative (Details)
1 Months Ended 12 Months Ended
Mar. 02, 2020
$ / shares
shares
Nov. 30, 2018
USD ($)
$ / shares
shares
Aug. 31, 2018
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
Jun. 29, 2018
$ / shares
shares
Dec. 09, 2016
$ / shares
shares
Mar. 08, 2016
$ / shares
shares
Class of Warrant or Right [Line Items]                
Warrants exercise price (USD per share) | $ / shares       $ 1.76 $ 6.32      
Expense recognized | $         $ 165,000      
Exercised (shares)       11,678,458        
Granted (shares)       32,023,503        
Outstanding at January 1, 2019       4 years 9 months 25 days 4 years 8 months 1 day      
Subsequent Event                
Class of Warrant or Right [Line Items]                
Warrants exercise price (USD per share) | $ / shares $ 0.75              
Exercised (shares) 3,200,000              
Initial Public Offering                
Class of Warrant or Right [Line Items]                
Warrants previously exercisable for preferred stock     37,200,000          
Warrants expired on the effective date     35,700,000          
Remaining warrants previously exercisable for preferred stock adjusted to become exercisable for common stock     1,500,000          
Offering costs | $     $ 4,300,000          
Warrants exercisable for convertible preferred stock (shares)     0          
Series D Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares (shares)             291,667 510,417
Warrants exercise price (USD per share) | $ / shares             $ 0.48 $ 0.48
Series D-1 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares (shares)           625,000    
Warrants exercise price (USD per share) | $ / shares           $ 0.48    
Common Stock                
Class of Warrant or Right [Line Items]                
Warrants exercise price (USD per share) | $ / shares   $ 8.25         $ 6.99 $ 20.56
Term   5 years            
Common Stock | LifeSci Capital, LLC                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares (shares)   44,183            
Payments to issue warrants | $   $ 150,000            
Common Stock | Russell Creative Group                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares (shares)   3,311            
Payments to issue warrants | $   $ 15,000            
Expected life | Series D-1 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Fair value assumptions term       10 years        
Risk-free interest rate | Series D-1 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Fair value assumptions       0.0293        
Volatility | Series D-1 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Fair value assumptions       0.6228        
Warrant                
Class of Warrant or Right [Line Items]                
Debt issuance costs | $       $ 675,617 $ 176,813      
Offering costs | $         $ 361,149      
Common Stock Warrants, Original Agreement                
Class of Warrant or Right [Line Items]                
Warrants exercise price (USD per share) | $ / shares       $ 0.86        
Common Stock Warrants, Amended Agreement | Subsequent Event                
Class of Warrant or Right [Line Items]                
Warrants exercise price (USD per share) | $ / shares $ 1.06              
Exercisable term 6 months              
Granted (shares) 3,200,000              
Outstanding at January 1, 2019 5 years 6 months