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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock Issued [Member]
In Treasury [Member]
Additional Paid-in Capital [Member]
Accumulated deficit [Member]
Accumulated Other Comprehensive (loss) income [Member]
Balance at Dec. 31, 2012 $ 20,009 $ 48 $ (51) $ 218,783 $ (198,808) $ 37
Balance (in shares) at Dec. 31, 2012   4,811,588 (1,757)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Compensation expense for issuance of stock options 174 $ 0 $ 0 174 0 0
Compensation expense for issuance of restricted stock 117 $ 0 $ 0 117 0 0
Compensation expense for issuance of restricted stock (in shares)   8,604 0      
Sale of common stock, net of expenses $ 41,460 $ 36 $ 0 41,424 0 0
Sale of common stock, net of expenses (in shares) 0 3,570,061 0      
Exercise of warrants $ 243 $ 0 $ 0 243 0 0
Exercise of warrants (in shares)   12,669 0      
Fair value of warrants exercised 218 $ 0 $ 0 218 0 0
Fair value of warrants issued classified as liability (1,857) 0 0 (1,857) 0 0
Net loss (30,324) 0 0 0 (30,324) 0
Foreign currency translation 59 0 0 0 0 59
Balance at Dec. 31, 2013 30,099 $ 84 $ (51) 259,102 (229,132) 96
Balance (in shares) at Dec. 31, 2013   8,402,922 (1,757)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Compensation expense for issuance of stock options 391 $ 0 $ 0 391 0 0
Compensation expense for issuance of restricted stock 100 $ 0 $ 0 100 0 0
Compensation expense for issuance of restricted stock (in shares)   28,256 0      
Sale of common stock, net of expenses 4,743 $ 13 $ 0 4,730 0 0
Sale of common stock, net of expenses (in shares)   1,260,079 0      
Exercise of warrants 126 $ 0 $ 0 126 0 0
Exercise of warrants (in shares)   49,137 0      
Fair value of warrants exercised 143 $ 0 $ 0 143 0 0
Net loss (17,381) 0 0 0 (17,381) 0
Foreign currency translation (76) 0 0 0 0 (76)
Balance at Dec. 31, 2014 18,145 $ 97 $ (51) 264,592 (246,513) 20
Balance (in shares) at Dec. 31, 2014   9,740,394 (1,757)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Compensation expense for issuance of stock options 349 $ 0 $ 0 349 0 0
Compensation expense for issuance of restricted stock 308 $ 6 $ 0 302 0 0
Compensation expense for issuance of restricted stock (in shares)   575,862 0      
Sale of common stock, net of expenses 8,479 $ 118 $ 0 8,361 0 0
Sale of common stock, net of expenses (in shares)   11,810,000 0      
Exercise of warrants 176 $ 2 $ 0 174 0 0
Exercise of warrants (in shares)   215,318 0      
Fair value of warrants exercised 123 $ 0 $ 0 123 0 0
Fair value of warrants issued classified as liability (4,247) 0 0 (4,247) 0 0
Net loss (14,704) 0 0 0 (14,704) 0
Foreign currency translation (28) 0 0 0 0 (28)
Balance at Dec. 31, 2015 $ 8,601 $ 223 $ (51) $ 269,654 $ (261,217) $ (8)
Balance (in shares) at Dec. 31, 2015   22,341,574 (1,757)