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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Common stock, shares authorized 70,000,000 70,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 43,805,586 40,455,352
Common stock, shares outstanding 43,805,586 40,455,352
Series B Preferred Stock    
Preferred stock, shares authorized 54,425 54,425
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares issued 83 83
Preferred stock, shares outstanding 83 83
Preferred stock, liquidation preference $ 0.001 $ 0.001