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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Common Stock Issued [Member] | In Treasury [Member] | Additional Paid-in Capital [Member] | Accumulated deficit [Member] | Accumulated Other Comprehensive (loss) income [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 430 | $ (51) | $ 144,783 | $ (116,055) | $ (26) | $ 29,081
Balance (in shares) at Dec. 31, 2010 | 43,028,146 | (28,100) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of stock options | 0 | 0 | 3,605 | 0 | 0 | 3,605
Compensation expense for issuance of restricted stock | 2 | 0 | 652 | 0 | 0 | 654
Compensation expense for issuance of restricted stock (in shares) | 173,212 | 0 |  |  |  |
Exercise of options, common stock surrendered upon restricted stock vesting | 0 | 0 | 82 | 0 | 0 | 82
Exercise of options, common stock surrendered upon restricted stock vesting (in shares) | 36,272 | 0 |  |  |  |
Sale of common stock, net of expenses | 50 | 0 | 23,491 | 0 | 0 | 23,541
Sale of common stock, net of expenses (in shares) | 5,000,000 | 0 |  |  |  |
Change in unrealized loss on investments | 0 | 0 | 0 | 0 | 26 | 26
Foreign currency translation |  |  |  |  |  | 0
Net loss | 0 | 0 | 0 | (30,885) | 0 | (30,885)
Balance at Dec. 31, 2011 | 482 | (51) | 172,613 | (146,940) | 0 | 26,104
Balance (in shares) at Dec. 31, 2011 | 48,237,630 | (28,100) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of stock options | 0 | 0 | 2,807 | 0 | 0 | 2,807
Compensation expense for issuance of restricted stock | 4 | 0 | 1,014 | 0 | 0 | 1,018
Compensation expense for issuance of restricted stock (in shares) | 408,687 | 0 |  |  |  |
Sale of common stock, net of expenses | 252 | 0 | 36,995 | 0 | 0 | 37,247
Sale of common stock, net of expenses (in shares) | 25,227,259 | 0 |  |  |  |
Change in unrealized loss on investments |  |  |  |  |  | 0
Exercise of warrants | 30 | 0 | 4,404 | 0 | 0 | 4,434
Exercise of warrants (in shares) | 2,975,457 | 0 |  |  |  |
Fair value of warrants reclassified from liability to additional paid-in capital upon issuance and/or exercise | 0 | 0 | 908 | 0 | 0 | 908
Fair value of warrants issued classified as liability | 0 | 0 | (678) | 0 | 0 | (678)
Foreign currency translation | 0 | 0 | 0 | 0 | 37 | 37
Net loss | 0 | 0 | 0 | (51,868) | 0 | (51,868)
Balance at Dec. 31, 2012 | 768 | (51) | 218,063 | (198,808) | 37 | 20,009
Balance (in shares) at Dec. 31, 2012 | 76,849,033 | (28,100) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of stock options | 0 | 0 | 174 | 0 | 0 | 174
Compensation expense for issuance of restricted stock | 1 | 0 | 116 | 0 | 0 | 117
Compensation expense for issuance of restricted stock (in shares) | 137,651 | 0 |  |  |  |
Sale of common stock, net of expenses | 572 | 0 | 40,888 | 0 | 0 | 41,460
Sale of common stock, net of expenses (in shares) | 57,120,964 | 0 |  |  |  |
Change in unrealized loss on investments |  |  |  |  |  | 0
Exercise of warrants | 2 | 0 | 241 | 0 | 0 | 243
Exercise of warrants (in shares) | 202,689 | 0 |  |  |  |
Fair value of warrants reclassified from liability to additional paid-in capital upon issuance and/or exercise | 0 | 0 | 218 | 0 | 0 | 218
Fair value of warrants issued classified as liability | 0 | 0 | (1,857) | 0 | 0 | (1,857)
Foreign currency translation | 0 | 0 | 0 | 0 | 59 | 59
Net loss | 0 | 0 | 0 | (30,324) | 0 | (30,324)
Balance at Dec. 31, 2013 | $ 1,343 | $ (51) | $ 257,843 | $ (229,132) | $ 96 | $ 30,099
Balance (in shares) at Dec. 31, 2013 | 134,310,337 | (28,100) |  |  |  |

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