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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 |  |  |  |  |

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