Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Comprehensive Income [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2013 $ (3,987) $ 40 $ 1,077,150 $ (1) $ (1,081,176)
Balance (in shares) at Dec. 31, 2013   5,269      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options, contributions to 401(k) and incentive plans 4,526 $ 1 4,525    
Exercise of stock options, contributions to 401(k) and incentive plans (in shares)   54      
Vesting of restricted stock units (in shares)   49      
Stock-based compensation expense 10,772   10,772    
Sale of shares / Issuance of common stock 37,786 $ 3 37,783    
Sale of shares / Issuance of common stock (in shares)   405      
Issuance of warrants (10,258)   (10,258)    
Exercise of warrants 2,560   2,560    
Exercise of warrants (in shares)   18      
Net loss (38,301)       (38,301)
Other comprehensive income (loss) 1     $ 1  
Balance at Dec. 31, 2014 3,099 $ 44 1,122,532   (1,119,477)
Balance (in shares) at Dec. 31, 2014   5,795      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options, contributions to 401(k) and incentive plans 1,467   1,467    
Exercise of stock options, contributions to 401(k) and incentive plans (in shares)   27      
Vesting of restricted stock units (in shares)   60      
Stock-based compensation expense 9,727   9,727    
Issuance of warrants 450   450    
Exercise of warrants 3,554 $ 1 3,553    
Exercise of warrants (in shares)   70      
Net loss (20,606)       (20,606)
Balance at Dec. 31, 2015 (2,309) $ 45 1,137,729   (1,140,083)
Balance (in shares) at Dec. 31, 2015   5,952      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options, contributions to 401(k) and incentive plans 844   844    
Exercise of stock options, contributions to 401(k) and incentive plans (in shares)   36      
Vesting of restricted stock units   $ 1 (1)    
Vesting of restricted stock units (in shares)   113      
Stock-based compensation expense 7,645   7,645    
Sale of shares / Issuance of common stock 43   43    
Sale of shares / Issuance of common stock (in shares)   13      
Issuance of warrants 97   97    
Net loss (53,530)       (53,530)
Balance at Dec. 31, 2016 $ (47,210) $ 46 $ 1,146,357   $ (1,193,613)
Balance (in shares) at Dec. 31, 2016   6,114