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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Preferred stock par value (in usd per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 109,301,762 99,531,034
Common stock, shares outstanding (in shares) 109,301,762 99,531,034