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Warrants to Purchase Common Stock (Details) - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Warrants    
Warrants Outstanding, Beginning Balance 4,531,924 828,221
Warrants Outstanding, Ending Balance 4,531,924 828,221
Warrants Exercisable at end 4,531,924 828,221
Weighted Avg. Exercise Price    
Weighted Avg. Exercise Price Outstanding, Beginning Balance $ 0.72 $ 1.51
Weighted Avg. Exercise Price Outstanding, Ending balance 0.72 1.51
Weighted Avg. Exercise Price Exercisable at end $ 0.72 $ 1.51
Weighted-Average Remaining Contractual Term    
Weighted-Average Remaining Contractual Term Outstanding at beginning 4 years 6 months 21 days  
Weighted-Average Remaining Contractual Term Outstanding at beginning 4 years 6 months 21 days 6 years 1 month 6 days
Weighted-Average Remaining Contractual Term Exercisable at end 4 years 6 months 21 days 6 years 1 month 6 days