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Stockholders’ Equity - Warrants (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Warrants          
Exercise of warrants $ 0 $ 0 $ 0 $ 0  
Warrants to purchase 1,014,204   1,014,204   1,014,204