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Stockholders' Equity (Details) - Employee Stock Option [Member] - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options/Warrants, Beginning Balance 10,960,800 10,960,800
Number of Options, Issued 3,400,000 1,600,000
Number of Options, Expired (550,000)
Number of Options, Exercised (40,800) (1,339,473)
Number of Options/Warrants, Ending balance 13,820,000 10,960,800