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Warrants - Summary (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Class of Warrant or Right [Line Items]        
Exercise price of warrants (USD per share)   $ 0.001   $ 0.001
Number of warrants outstanding (shares) 10,417,887   10,417,887  
Warrants exercised via cashless exercises (shares) 0 0 1,400,025 0
Common stock issued from exercise of warrants (shares)     1,400,000  
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) 5,858,238   5,858,238  
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