Annual report pursuant to Section 13 and 15(d)

Warrants (Details)

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Warrants (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Warrants    
Total warrants were exercised 4,503,346 1,795,030
Intrinsic value of outstanding warrants $ 4,275 $ 720