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Stock Warrants - Summary of all warrant activity (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Stock-Based Compensation    
Number of Warrants, Beginning Balance 18,915,851 915,138
Number of Warrants, Granted 0 18,000,713
Number of Warrants, Exercised 0  
Number of Warrants, Forfeited 0  
Number of Warrants, Ending Balance 18,915,851 18,915,851
Weighted Average Exercise Price, Beginning Balance $ 3.85 $ 52.50
Weighted Average Exercise Price, Granted 0 1.38
Weighted Average Exercise Price, Exercised 0  
Weighted Average Exercise Price, Forfeited 0  
Weighted Average Exercise Price, Ending Balance $ 3.85 $ 3.85