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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares | Sep. 30, 2015 | Dec. 31, 2014
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Stockholders' equity: |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 125,000,000 | 125,000,000
Common stock, shares outstanding (in shares) | 34,248,240 | 27,995,638
Treasury stock, shares (in shares) | 0 | 865

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