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Consolidated Statements Of Stockholders' Deficit - USD ($)
$ in Thousands
Total
Series A Preferred Stock
Preferred Shares
Preferred Shares
Series A Preferred Stock
Common Shares
Treasury Stock
Additional Paid-in Capital
Additional Paid-in Capital
Series A Preferred Stock
Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2012         150,360,933 (20,079)      
Beginning Balance at Dec. 31, 2012 $ (3,997)       $ 124,597 $ (217) $ 619,266   $ (747,643)
Exercise of warrants (in shares)         147,050        
Exercise of warrants 160       $ 113   47    
Exercise of stock options (in shares)         386,000        
Exercise of stock options 627       $ 292   335    
Issuance of shares (in shares)         21,700,000        
Issuance of shares 121,206       $ 16,401   104,805    
Vesting of restricted stock units (in shares)         93,048        
Vesting of restricted stock units         $ 71   (71)    
Tax provision on stock-based compensation (361)           (361)    
Transfer of fair value of warrants exercised from liabilities to equity 24           24    
Share issuances for services (in shares)         4,032        
Share issuances for services 27       $ 3   24    
Stock-based compensation 14,685           14,685    
Net loss (166,227)               (166,227)
Ending Balance (in shares) at Dec. 31, 2013         172,691,063 (20,079)      
Ending Balance at Dec. 31, 2013 $ (33,856)       $ 141,477 $ (217) 738,754   (913,870)
Exercise of warrants (in shares) 1,684,888       1,684,888        
Exercise of warrants $ 1,651       $ 1,443   208    
Exercise of stock options (in shares) 234,500       234,500        
Exercise of stock options $ 307       $ 193   114    
Reacquisition of conversion option in convertible notes (10,100)           (10,100)    
Tax provision on stock-based compensation (2,299)           (2,299)    
Stock-based compensation 9,022           9,022    
Refund of equity issuance costs 3,191           3,191    
Net loss (56,364)               (56,364)
Ending Balance (in shares) at Dec. 31, 2014         174,610,451 (20,079)      
Ending Balance at Dec. 31, 2014 (88,448)       $ 143,113 $ (217) 738,890   (970,234)
Conversion of Series A Convertible Preferred Stock, net (in shares)     (62,833,330)   6,283,333        
Conversion of Series A Convertible Preferred Stock, net (187)   $ (4,804)   $ 4,804   (187)    
Preferred stock purchase option $ 946           1,814   (868)
Preferred stock beneficial conversion features             32,987   (32,987)
Exercise of warrants (in shares) 1,844,585       1,844,585        
Exercise of warrants $ 2,713       $ 1,429   1,284    
Exercise of stock options (in shares) 18,020       18,020        
Exercise of stock options $ 31       $ 13   18    
Issuance of shares (in shares)       391,017,970          
Issuance of shares   $ 57,853   $ 29,168       $ 28,685  
Vesting of restricted stock units (in shares)         821,376 (154,423)      
Vesting of restricted stock units (194)       $ 619 $ (194) (619)    
Reacquisition of conversion option in convertible notes (1,300)           (1,300)    
Tax benefits realized from stock-based compensation 727           727    
Stock-based compensation 13,872           13,872    
Net loss (115,204)               (115,204)
Ending Balance (in shares) at Dec. 31, 2015     328,184,640   183,577,765 (174,502)      
Ending Balance at Dec. 31, 2015 $ (129,191)   $ 24,364   $ 149,978 $ (411) $ 816,171   $ (1,119,293)