Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Share (Details)

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Net Income (Loss) Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income (loss) used for basic earnings per share $ (1,145) $ (5,356) $ 9,920 $ (14,901)
Less change in fair value of warrant liability (1,010) (3,673) 1,306 (1,734)
Net (loss) income used for diluted earnings per share $ (135) $ (1,683) $ 8,614 $ (13,167)
Denominator:        
Basic weighted-average outstanding common shares 82,544 66,839 81,125 63,748
Effect of dilutive potential common shares resulting from options 0 0 624 78
Effect of dilutive potential common shares resulting from warrants 0 0 83 6,363
Weighted-average shares outstanding—diluted 82,544 66,839 81,832 70,189
Net income (loss) per common share:        
Basic (in dollars per share) $ (0.01) $ (0.12) $ 0.12 $ (0.23)
Diluted (in dollars per share) $ 0.00 $ (0.07) $ 0.11 $ (0.19)