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Warrants Warrants - Additional Information (Details) - $ / shares
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Apr. 28, 2017
Series B Warrant        
Class of Warrant or Right [Line Items]        
Warrants, exercise price (in dollars per share)       $ 1.00
Warrants Not Settleable in Cash        
Class of Warrant or Right [Line Items]        
Number of warrants, outstanding (in shares) 5,465,763   4,329,437  
Warrants Not Settleable in Cash | Series B Warrant        
Class of Warrant or Right [Line Items]        
Warrants, exercise price after adjustment (in dollars per share) $ 0.67      
Number of warrants, issued (in shares) 1,336,326      
Number of warrants, outstanding (in shares) 4,065,411 2,729,085