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Stockholders' Equity - Common Stock Warrants (Details) - $ / shares
3 Months Ended 9 Months Ended
Jun. 19, 2018
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Feb. 28, 2019
Dec. 31, 2018
Common Stock Warrants            
Par value of common stock (in dollars per share)   $ 0.001 $ 0.001     $ 0.001
Common stock            
Common Stock Warrants            
Number of shares issued   161,349 564,590 539,026    
February 2019 Warrants | Common stock            
Common Stock Warrants            
Number of common shares which may be purchased with warrants         2,000,000  
February 2019 Warrants | Common stock warrants            
Common Stock Warrants            
Exercise price of warrants (in dollars per share)         $ 6.25  
Warrants term         5 years  
Warrants outstanding   1,991,300 1,991,300      
Weighted average remaining contractual life     4 years 4 months 10 days      
June 2018 Warrants | Common stock            
Common Stock Warrants            
Number of shares issued 4,200,000          
Par value of common stock (in dollars per share) $ 0.001          
June 2018 Warrants | Common stock warrants            
Common Stock Warrants            
Number of common shares which may be purchased with warrants 4,200,000          
Exercise price of warrants (in dollars per share) $ 12.00          
Warrants term 5 years          
Weighted average remaining contractual life     3 years 8 months 23 days