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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Stockholders' equity:    
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, authorized (in shares) 10,000,000 10,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, authorized (in shares) 100,000,000 100,000,000
Common stock, issued (in shares) 52,547,257 51,996,701
Common stock, outstanding (in shares) 52,547,257 51,996,701