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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)