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Stockholders Equity - Narrative (Details)
9 Months Ended
Sep. 30, 2020
USD ($)
vote
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Apr. 30, 2019
$ / shares
Oct. 31, 2015
$ / shares
Class of Warrant or Right [Line Items]        
Preferred stock authorized (in shares) 5,000,000 5,000,000    
Preferred stock par value (in USD per share) | $ / shares $ 0.001 $ 0.001    
Preferred stock issued (in shares) 0 0    
Preferred stock outstanding (in shares) 0 0    
Shares authorized (in shares) 100,000,000 100,000,000    
Par value (in USD per share) | $ / shares $ 0.001 $ 0.001    
Shares issued (in shares) 33,889,077 31,255,267    
Shares outstanding (in shares) 33,889,077 31,255,267    
Dividends declared | $ $ 0      
Number of votes entitled per share of common stock | vote 1      
Common Stock Warrant        
Class of Warrant or Right [Line Items]        
Warrants outstanding (in shares) 0 0    
IPO        
Class of Warrant or Right [Line Items]        
Stock issued, price per share (in USD per share) | $ / shares $ 20.00   $ 20.00 $ 20.00
IPO | Common Stock Warrant        
Class of Warrant or Right [Line Items]        
Shares converted (in shares) 5,968