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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2014 $ (5,702)   $ 7 $ 331,864 $ 700 $ (338,273)
Balance (in shares) at Dec. 31, 2014   5,311 6,623,225      
Share-based compensation 2,041     2,041    
Issuance of common stock under stock option plan and employee stock purchase plan 27     27    
Issuance of common stock under stock option plan and employee stock purchase plan (in shares)     15,437      
Conversion of Series A 3.6% Convertible Preferred Stock into common stock (2)   $ 1 (3)    
Conversion of Series A 3.6% Convertible Preferred Stock into common stock (in shares)   (5,311) 680,943      
Issuance of common stock under stock warrant agreement, net 22,813   $ 3 22,810    
Issuance of common stock under stock warrant agreement, net (in shares)     3,123,577      
Sale/Issuance of common stock 10,701   $ 2 10,699    
Sale/Issuance of common stock (in shares)     2,560,711      
Allocation of fair value for debt-related warrants 776     776    
Foreign currency translation adjustment and accumulated other comprehensive income 296       296  
Net loss (18,744)         (18,744)
Balance at Dec. 31, 2015 $ 12,206   $ 13 368,214 996 (357,017)
Balance (in shares) at Dec. 31, 2015 13,003,893   13,003,893      
Share-based compensation $ 1,080     1,080    
Issuance of common stock under employee stock purchase plan 6     6    
Issuance of common stock under employee stock purchase plan (in shares)     30,744      
Sale/Issuance of common stock 19,478   $ 9 19,469    
Sale/Issuance of common stock (in shares)     8,673,253      
Foreign currency translation adjustment and accumulated other comprehensive income 262       262  
Net loss (22,046)         (22,046)
Balance at Dec. 31, 2016 $ 10,986   $ 22 $ 388,769 $ 1,258 $ (379,063)
Balance (in shares) at Dec. 31, 2016 21,707,890   21,707,890