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Warrants (Details 1) - Stock Warrants - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Number of Shares Underlying Warrants    
Beginning balance 2,044,583 2,094,583
Granted
Expired (1,000,000) (50,000)
Ending balance 1,044,583 2,044,583
Weighted average exercise price    
Beginning Balance $ 1.67 $ 1.65
Granted
Expired 2.25 0.89
Ending Balance $ 1.11 $ 1.67