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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, 2009 $ 362 $ (51) $ 92,835 $ (69,371) $ (16) $ 23,759
Balance (in shares) at Dec. 31, 2009 36,223,097 (28,100)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Compensation expense for issuance of stock options 0 0 3,839 0 0 3,839
Compensation expense for issuance of restricted stock 4 0 1,671 0 0 1,675
Compensation expense for issuance of restricted stock (in shares) 414,042 0        
Exercise of warrants and options, common stock surrendered upon restricted stock vesting 12 0 3,830 0 0 3,842
Exercise of options, common stock surrendered upon restricted stock vesting (in shares) 1,206,007 0        
Sale of common stock, net of expenses 52 0 33,454 0 0 33,506
Sale of common stock, net of expenses (in shares) 5,185,000 0       5,185,000
Change in unrealized loss on investments 0 0 0 0 (10) (10)
Fair value of warrants reclassified from liability to additional paid-in capital upon exercise 0 0 9,154 0 0 9,154
Foreign currency translation           0
Net loss 0 0 0 (46,684) 0 (46,684)
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 warrants and options, common stock surrendered upon restricted stock vesting (in shares) 36,272 0        
Exercise of options, common stock surrendered upon restricted stock vesting 0 0 82 0 0 82
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       5,000,000
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       15,333,340
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 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)