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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (USD $)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Amount due From Exercises of Stock Options[Member]
Balance at Dec. 31, 2008 $ (7,717,000) $ 31,000 $ 161,214,000 $ (162,168,000) $ (6,794,000) $ 0 $ 0
Balance (in shares) at Dec. 31, 2008   31,176,275     1,872,834    
Cumulative effect of change in accounting for certain warrants (1,698,000) 0 (4,578,000) 2,880,000 0 0 0
Stock-based compensation expense 2,649,000 0 2,649,000 0 0 0 0
Issuance of common stock under stock option plan (in shares)   203,707          
Issuance of common stock under stock option plan 410,000 0 410,000 0 0 0 0
Issuance of common stock under stock warrant agreement (in shares)   46,154          
Issuance of common stock under stock warrant agreement 121,000   121,000 0 0 0 0
Sale of common stock (in shares)   8,613,123          
Sale of common stock, net 21,860,000 9,000 21,851,000 0   0 0
Sale of treasury stock 3,933,000 0 (2,861,000) 0 6,794,000 0 0
Sale of treasury stock (in shares)         (1,872,834)    
Net loss (23,216,000) 0 0 (23,216,000) 0 0 0
Balance at Dec. 31, 2009 (3,658,000) 40,000 178,806,000 (182,504,000) 0 0 0
Balance (in shares) at Dec. 31, 2009   40,039,259          
Stock-based compensation expense 3,055,000 0 3,055,000 0 0 0 0
Issuance of common stock under stock option plan (in shares)   378,705          
Issuance of common stock under stock option plan 1,393,000 0 1,393,000 0 0 0 0
Issuance of common stock under stock warrant agreement (in shares)   2,208,730          
Issuance of common stock under stock warrant agreement 5,735,000 2,000 5,733,000 0 0 0 0
Sale of common stock (in shares)   9,328,571          
Sale of common stock, net 43,563,000 10,000 43,553,000 0 0 0 0
Allocation of fair value for debt-related warrants 279,000 0 279,000 0 0 0 0
Net loss (27,494,000) 0 0 (27,494,000) 0 0 0
Balance at Dec. 31, 2010 22,873,000 52,000 232,819,000 (209,998,000) 0 0 0
Balance (in shares) at Dec. 31, 2010 51,955,265 51,955,265          
Stock-based compensation expense 3,316,000 0 3,316,000 0 0 0 0
Issuance of common stock under stock option plan (in shares)   222,283          
Issuance of common stock under stock option plan 767,000 0 767,000 0 0 0 0
Issuance of common stock under stock warrant agreement (in shares)   340,873          
Issuance of common stock under stock warrant agreement 2,082,000 1,000 2,081,000 0 0 0 0
Sale of common stock (in shares)   4,076,262          
Sale of common stock, net 13,092,000 4,000 13,088,000 0 0 0 0
Allocation of fair value for debt-related warrants 267,000 0 267,000 0 0 0 0
Net loss (32,451,000) 0 0 (32,451,000) 0 0 0
Balance at Dec. 31, 2011 $ 9,946,000 $ 57,000 $ 252,338,000 $ (242,449,000) $ 0 $ 0 $ 0
Balance (in shares) at Dec. 31, 2011 56,594,683 56,594,683