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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Consolidated Balance Sheets    
Common stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Common stock, authorized 100,000,000 50,000,000
Common stock, issued 32,044,087 27,555,948
Common stock, outstanding 32,044,087 27,555,948