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Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Convertible preferred stock, par value $ 0.001 $ 0.001
Convertible preferred stock, shares authorized 135,000 135,000
Convertible preferred stock, issued 0 0
Convertible preferred stock, outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 21,001,690 15,685,562
Common stock, shares outstanding 21,001,690 15,685,562