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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2016
Dec. 31, 2015
Stockholders’ equity:    
Convertible preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Convertible preferred stock, Authorized shares 5,000,000 5,000,000
Convertible preferred stock, Issued shares 0 0
Convertible preferred stock, Outstanding shares 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, Authorized shares 500,000,000 500,000,000
Common stock, Issued shares 110,077,451 109,287,591
Common stock, Outstanding shares 110,077,451 109,287,591