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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Treasury Stock
Beginning Balance, shares at Dec. 31, 2019   56,448        
Balance at beginning of period at Dec. 31, 2019 $ 154,028 $ 1,545 $ 895,899 $ (854) $ (702,576) $ (39,986)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 9,800   9,800      
Issuance of common stock under equity incentive plans, net of forfeitures (in shares)   2,102        
Issuance of common stock under equity incentive plans, net of forfeitures 14,097 $ 51 14,046      
Issuance of common stock in connection with public offering (in shares)   3,220        
Issuance of common stock in connection with public offering 60,063 $ 82 59,981      
Treasury stock retirement 0 $ (134) (39,852)     39,986
Net income 9,382       9,382  
Other comprehensive income (loss) 161     161    
Ending Balance, shares at Sep. 26, 2020   61,770        
Balance at end of period at Sep. 26, 2020 247,531 $ 1,544 939,874 (693) (693,194) 0
Beginning Balance, shares at Jun. 27, 2020   58,143        
Balance at beginning of period at Jun. 27, 2020 159,168 $ 1,587 912,402 (1,103) (713,732) (39,986)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 3,574   3,574      
Issuance of common stock under equity incentive plans, net of forfeitures (in shares)   407        
Issuance of common stock under equity incentive plans, net of forfeitures 3,778 $ 9 3,769      
Issuance of common stock in connection with public offering (in shares)   3,220        
Issuance of common stock in connection with public offering 60,063 $ 82 59,981      
Treasury stock retirement 0 $ (134) (39,852)     39,986
Net income 20,538       20,538  
Other comprehensive income (loss) 410     410    
Ending Balance, shares at Sep. 26, 2020   61,770        
Balance at end of period at Sep. 26, 2020 $ 247,531 $ 1,544 939,874 (693) (693,194) 0
Beginning Balance, shares at Dec. 31, 2020 62,122 62,122        
Balance at beginning of period at Dec. 31, 2020 $ 280,325 $ 1,553 948,055 (191) (669,092) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 18,055   18,055      
Issuance of common stock under equity incentive plans, net of forfeitures (in shares)   1,610        
Issuance of common stock under equity incentive plans, net of forfeitures 18,764 $ 41 18,723      
Net income 218,497       218,497  
Other comprehensive income (loss) $ (15)     (15)    
Ending Balance, shares at Oct. 02, 2021 63,732 63,732        
Balance at end of period at Oct. 02, 2021 $ 535,626 $ 1,594 984,833 (206) (450,595) 0
Beginning Balance, shares at Jul. 03, 2021   63,200        
Balance at beginning of period at Jul. 03, 2021 345,638 $ 1,580 972,259 (182) (628,019) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 6,661   6,661      
Issuance of common stock under equity incentive plans, net of forfeitures (in shares)   532        
Issuance of common stock under equity incentive plans, net of forfeitures 5,927 $ 14 5,913      
Net income 177,424       177,424  
Other comprehensive income (loss) $ (24)     (24)    
Ending Balance, shares at Oct. 02, 2021 63,732 63,732        
Balance at end of period at Oct. 02, 2021 $ 535,626 $ 1,594 $ 984,833 $ (206) $ (450,595) $ 0