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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Stockholders' equity (deficit): |  |
Common stock, par value (in dollars per share) | $ 0.0075 | $ 0.0075
Common stock, shares authorized (in shares) | 138,666,666 | 138,666,666
Common stock, shares outstanding (in shares) | 106,885,926 | 105,386,216

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