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Nature of Business - Going Concern (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Net loss $ (3,943,819) $ (6,312,606)    
Accumulated deficit (55,423,643)   $ (51,479,824)  
Cash, cash equivalents and restricted cash $ 3,344,288 $ 459,342 $ 7,595,068 $ 1,778,613