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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Accumulated Other Comprehensive (Loss) Income
Accumulated Deficit
Total
Balance at Dec. 31, 2013 $ 1,354,696 $ (295) $ (607,634) $ 746,767
Balance (in shares) at Dec. 31, 2013 297,159,000      
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation $ 609     609
Exercise of stock options $ 129     129
Exercise of stock options (in shares) 61,000      
Unrealized (loss) gain on available-for-sale securities, net of taxes   3   3
Net loss     (86,135) (86,135)
Balance at Jun. 30, 2014 $ 1,355,434 (292) (693,769) 661,373
Balance (in shares) at Jun. 30, 2014 297,220,000      
Balance at Dec. 31, 2014 $ 1,360,668 124 (919,577) 441,215
Balance (in shares) at Dec. 31, 2014 300,100,000      
Increase (Decrease) in Shareholders' Equity        
Shares issued for settlement of accounts payable $ 443     443
Shares issued for settlement of accounts payable (in shares) 430,295      
Stock-based compensation $ 754     754
Unrealized (loss) gain on available-for-sale securities, net of taxes   (647)   (647)
Net loss     (8,095) (8,095)
Balance at Jun. 30, 2015 $ 1,361,865 $ (523) $ (927,672) $ 433,670
Balance (in shares) at Jun. 30, 2015 300,530,000