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Warrants - Summary (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Class of Warrant or Right [Line Items]          
Exercise price of warrants (USD per share)         $ 0.001
Number of warrants outstanding (shares) 9,692,879   9,692,879    
Warrants exercised via cashless exercises (shares) 725,008 0 2,125,033 0  
Common stock issued from exercise of warrants (shares) 725,000   2,125,000    
January 11, 2017 Warrants          
Class of Warrant or Right [Line Items]          
Exercise price of warrants (USD per share) $ 0.001   $ 0.001    
Number of warrants outstanding (shares) 5,133,230   5,133,230    
November 20, 2017 Warrants          
Class of Warrant or Right [Line Items]          
Exercise price of warrants (USD per share) $ 0.001   $ 0.001    
Number of warrants outstanding (shares) 4,137,999   4,137,999    
June 11, 2018 Warrants          
Class of Warrant or Right [Line Items]          
Exercise price of warrants (USD per share) $ 0.001   $ 0.001    
Number of warrants outstanding (shares) 421,650   421,650