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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 170,000,000 170,000,000
Common stock, shares issued (in shares) 12,991,707 9,740,397
Common stock, shares outstanding (in shares) 12,385,016 9,708,841
Treasury stock, at cost (in shares) 1,757 1,757