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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, 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 INCOME (LOSS) (18,090)          
Share-based compensation expense:            
Stock option plans 1,256     1,256    
Restricted stock award plans 1,960     1,960    
Employee stock purchase plan 21     21    
Common stock issued under:            
Stock option plans $ 375 $ 1   374    
Stock option plan, shares 89,773 90,000        
Restricted stock award plans $ (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   83,538,000        
BALANCE, shares at Dec. 31, 2016     (15,019,000)      
Net income (loss) (31,897)         (31,897)
Foreign currency translation 288       288  
Unrealized gain (loss) on investments (194)       (194)  
COMPREHENSIVE INCOME (LOSS) (31,803)          
Share-based compensation expense:            
Stock option plans 1,585     1,585    
Restricted stock award plans 3,366     3,366    
Employee stock purchase plan 19     19    
Common stock issued under:            
Stock option plans $ 2,360 $ 3   2,357    
Stock option plan, shares 288,618 289,000        
Restricted stock award plans $ (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)      
Net income (loss) $ 55,181         55,181
Foreign currency translation (100)       (100)  
Unrealized gain (loss) on investments (34)       (34)  
COMPREHENSIVE INCOME (LOSS) 55,047          
Share-based compensation expense:            
Stock option plans 1,956     1,956    
Restricted stock award plans 3,641     3,641    
Employee stock purchase plan 17     17    
Common stock issued under:            
Stock option plans $ 1,363 $ 2   1,361    
Stock option plan, shares 161,072 161,000        
Restricted stock award plans $ (3,345) $ 7 $ (3,345) (7)    
Restricted stock award plan, shares   709,000 (239,000)      
Employee stock purchase plan 319     319    
Employee stock purchase plan, shares   24,000        
BALANCE at Dec. 31, 2018 $ 355,203 $ 852 $ (220,700) $ 628,295 $ (298) $ (52,946)
BALANCE, shares at Dec. 31, 2018 85,173,686 85,174,000        
BALANCE, shares at Dec. 31, 2018 (15,400,776)   (15,401,000)