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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
BALANCE at Dec. 31, 2014 $ 281,933 $ 823 $ (215,165) $ 606,531 $ (853) $ (109,403)
BALANCE, shares at Dec. 31, 2014   82,337,000        
BALANCE, shares at Dec. 31, 2014     (14,816,000)      
Net income (loss) 51,885         51,885
Unrealized gain (loss) on investments (27)       (27)  
COMPREHENSIVE (LOSS) INCOME 51,858          
Share-based compensation expense:            
Stock option plan 442     442    
Restricted stock award plan 2,385     2,385    
Employee stock purchase plan 30     30    
Common stock issued under:            
Stock option plan $ 828 $ 3   825    
Stock option plan, shares 303,035 303,000        
Restricted stock award plan $ (439) $ 2 $ (441)      
Restricted stock award plan, shares   214,000 (82,000)      
Employee stock purchase plan 573 $ 2   571    
Employee stock purchase plan, shares   143,000        
BALANCE at Dec. 31, 2015 337,610 $ 830 $ (215,606) 610,784 (880) (57,518)
BALANCE, shares at Dec. 31, 2015   82,997,000        
BALANCE, shares at Dec. 31, 2015     (14,898,000)      
Net income (loss) (18,712)         (18,712)
Foreign currency translation (77)       (77)  
Unrealized gain (loss) on investments 699       699  
COMPREHENSIVE (LOSS) INCOME (18,090)          
Share-based compensation expense:            
Stock option plan 1,256     1,256    
Restricted stock award plan 1,960     1,960    
Employee stock purchase plan 21     21    
Common stock issued under:            
Stock option plan $ 375 $ 1   374    
Stock option plan, shares 89,773 90,000        
Restricted stock award plan $ (563) $ 3 $ (563) (3)    
Restricted stock award plan, shares   387,000 (121,000)      
Employee stock purchase plan 398 $ 1   397    
Employee stock purchase plan, shares   64,000        
Tax benefit of stock settlements (1,464)     (1,464)    
BALANCE at Dec. 31, 2016 $ 321,503 $ 835 $ (216,169) 613,325 (258) (76,230)
BALANCE, shares at Dec. 31, 2016 83,538,033 83,538,000        
BALANCE, shares at Dec. 31, 2016 (15,019,028)   (15,019,000)      
Net income (loss) $ (31,897)         (31,897)
Foreign currency translation 288       288  
Unrealized gain (loss) on investments (194)       (194)  
COMPREHENSIVE (LOSS) INCOME (31,803)          
Share-based compensation expense:            
Stock option plan 1,585     1,585    
Restricted stock award plan 3,366     3,366    
Employee stock purchase plan 19     19    
Common stock issued under:            
Stock option plan $ 2,360 $ 3   2,357    
Stock option plan, shares 288,618 289,000        
Restricted stock award plan $ (1,187) $ 4 $ (1,186) (5)    
Restricted stock award plan, shares   416,000 (143,000)      
Employee stock purchase plan 362 $ 1   361    
Employee stock purchase plan, shares   37,000        
BALANCE at Dec. 31, 2017 $ 296,205 $ 843 $ (217,355) $ 621,008 $ (164) $ (108,127)
BALANCE, shares at Dec. 31, 2017 84,279,533 84,280,000        
BALANCE, shares at Dec. 31, 2017 (15,161,730)   (15,162,000)