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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance (In shares) at Dec. 29, 2018   74,139,712,000      
Beginning balance at Dec. 29, 2018 $ 580,164 $ 74 $ 862,897 $ 780 $ (283,587)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under the Employee Stock Purchase Plan (In shares)   544,271,000      
Issuance of common stock under the Employee Stock Purchase Plan 6,806   6,806    
Issuance of common stock pursuant to exercise of options for cash (In shares)   112,956,000      
Issuance of common stock pursuant to exercise of options 754   754    
Issuance of common stock pursuant to vesting of restricted stock units (In shares)   899,295,000      
Issuance of common stock pursuant to exercise of options (7,896) $ 2 (7,898)    
Stock-based compensation 16,968   16,968    
Other comprehensive loss (2,960)     (2,960)  
Net income 20,710       20,710
Ending balance (In shares) at Sep. 28, 2019   75,696,234,000      
Ending balance at Sep. 28, 2019 614,546 $ 76 879,527 (2,180) (262,877)
Beginning balance (In shares) at Jun. 29, 2019   74,691,781,000      
Beginning balance at Jun. 29, 2019 604,102 $ 75 875,024 159 (271,156)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under the Employee Stock Purchase Plan (In shares)   242,774,000      
Issuance of common stock under the Employee Stock Purchase Plan 3,136 $ 0 3,136    
Issuance of common stock pursuant to exercise of options for cash (In shares)   93,749,000      
Issuance of common stock pursuant to exercise of options 664   664    
Issuance of common stock pursuant to vesting of restricted stock units (In shares)   667,930,000      
Issuance of common stock pursuant to exercise of options (5,740)   (5,741)    
Stock-based compensation 6,444   6,444    
Other comprehensive loss (2,339)     (2,339)  
Net income 8,279       8,279
Ending balance (In shares) at Sep. 28, 2019   75,696,234,000      
Ending balance at Sep. 28, 2019 $ 614,546 $ 76 879,527 (2,180) (262,877)
Beginning balance (In shares) at Dec. 28, 2019 75,764,990 75,764,990,000      
Beginning balance at Dec. 28, 2019 $ 640,997 $ 76 885,821 (659) (244,241)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under the Employee Stock Purchase Plan (In shares)   485,566,000      
Issuance of common stock under the Employee Stock Purchase Plan 7,875   7,875    
Issuance of common stock pursuant to exercise of options for cash (In shares)   205,769,000      
Issuance of common stock pursuant to exercise of options 1,713 $ 1 1,712    
Issuance of common stock pursuant to vesting of restricted stock units (In shares)   927,169,000      
Issuance of common stock pursuant to exercise of options (15,382) $ 1 (15,383)    
Stock-based compensation 16,551   16,551    
Other comprehensive loss 3,138     3,138  
Net income $ 59,250       59,250
Ending balance (In shares) at Sep. 26, 2020 77,383,494 77,383,494,000      
Ending balance at Sep. 26, 2020 $ 714,142 $ 78 896,576 2,479 (184,991)
Beginning balance (In shares) at Jun. 27, 2020   76,501,459,000      
Beginning balance at Jun. 27, 2020 690,722 $ 77 898,069 458 (207,882)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under the Employee Stock Purchase Plan (In shares)   173,975,000      
Issuance of common stock under the Employee Stock Purchase Plan 3,809   3,809    
Issuance of common stock pursuant to exercise of options for cash (In shares)   608,060,000      
Issuance of common stock pursuant to exercise of options (11,582)   (11,583)    
Issuance of common stock pursuant to vesting of restricted stock units (In shares)   100,000,000      
Issuance of common stock pursuant to exercise of options 844 $ 1 844    
Stock-based compensation 5,437   5,437    
Other comprehensive loss 2,021     2,021  
Net income $ 22,891       22,891
Ending balance (In shares) at Sep. 26, 2020 77,383,494 77,383,494,000      
Ending balance at Sep. 26, 2020 $ 714,142 $ 78 $ 896,576 $ 2,479 $ (184,991)