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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance beginning at Dec. 31, 2012 $ 80,240 $ 1,484 $ 438,939 $ (358,163) $ (2,450) $ 430
Balance (in shares) at Dec. 31, 2012   148,398,747        
Non-cash compensation cost for stock options, ESPP and restricted stock 2,480 $ 0 2,480 0 0 0
Exercise of stock options/Purchase under ESPP 1,498 $ 7 1,491 0 0 0
Exercise of stock options/Purchase under ESPP, shares   667,867        
Issuance of common stock 170,590 $ 600 169,990 0 0 0
Issuance of common stock, shares   60,044,130        
Unrealized gain (loss) on marketable securities 186 $ 0 0 0 0 186
Foreign currency translation adjustment 223 0 0 0 0 223
Net loss (51,983) 0 0 (51,983) 0 0
Balance ending at Dec. 31, 2013 203,234 $ 2,091 612,900 (410,146) (2,450) 839
Balance ending (in shares) at Dec. 31, 2013   209,110,744        
Non-cash compensation cost for stock options, ESPP and restricted stock 6,090 $ 0 6,090 0 0 0
Exercise of stock options/Purchase under ESPP 2,790 $ 14 2,776 0 0 0
Exercise of stock options/Purchase under ESPP, shares   1,411,550        
Restricted stock issued as compensation 0 $ 0 0 0 0 0
Restricted stock issued as compensation, shares   15,000        
Issuance of common stock 107,895 $ 288 107,607 0 0 0
Issuance of common stock, shares   28,750,000        
Unrealized gain (loss) on marketable securities (680) $ 0 0 0 0 (680)
Foreign currency translation adjustment (6,764) 0 0 0 0 (6,764)
Net loss (82,947) 0 0 (82,947) 0 0
Balance ending at Dec. 31, 2014 229,618 $ 2,393 729,373 (493,093) (2,450) (6,605)
Balance ending (in shares) at Dec. 31, 2014   239,287,294        
Non-cash compensation cost for stock options, ESPP and restricted stock 13,431 $ 0 13,431 0 0 0
Exercise of stock options/Purchase under ESPP 4,801 $ 19 4,782 0 0 0
Exercise of stock options/Purchase under ESPP, shares   1,950,748        
Restricted stock issued as compensation 0 $ 0 0 0 0 0
Restricted stock issued as compensation, shares   25,000        
Issuance of common stock 204,275 $ 292 203,983 0 0 0
Issuance of common stock, shares   29,163,620        
Unrealized gain (loss) on marketable securities 42 $ 0 0 0 0 42
Foreign currency translation adjustment (2,561) 0 0 0 0 (2,561)
Net loss (156,937) 0 0 (156,937) 0 0
Balance ending at Dec. 31, 2015 $ 292,669 $ 2,704 $ 951,569 $ (650,030) $ (2,450) $ (9,124)
Balance ending (in shares) at Dec. 31, 2015   270,426,662