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Stockholders' Equity - Stock Warrant Activity During Period (Details) - Warrant [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Number of Warrants    
Outstanding and exercisable at January 1, 2018   1,214,815
Granted   115,000
Expired/Forfeited   (750,000)
Outstanding and exercisable at December 31, 2018 1,214,815 579,815
Weighted Average Exercise Price    
Outstanding and exercisable at January 1, 2018   $ 9.32
Granted   3.17
Expired/Forfeited   12.00
Outstanding and exercisable at December 31, 2018 $ 9.32 $ 4.63
Weighted Average Remaining Contractual Life (in Years), Outstanding and exercisable 1 year 7 months 28 days 2 years 3 months 26 days