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Consolidated Statements of Shareholders' (Deficit) Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income (Loss)
Balance at Jan. 02, 2016 $ 222,339 $ 494 $ 0 $ 221,859 $ (14)
Balance (in shares) at Jan. 02, 2016   49,402,000      
Net income 51,417 $ 0 0 51,417 0
Unrealized gain on available-for-sale marketable debt securities, net of tax 14 0 0 0 14
Exercise of common stock options 2,298 $ 2 2,296 0 0
Exercise of common stock options (in shares)   188,000      
Tax effect from stock-based compensation (1,016) $ 0 (1,016) 0 0
Stock-based compensation 11,961 $ 0 11,961 0 0
Stock-based compensation (in shares)   11,000      
Repurchases of common stock (126,693) $ (60) (13,241) (113,392) 0
Repurchases of common stock (in shares)   (6,032,000)      
Balance at Dec. 31, 2016 160,320 $ 436 0 159,884 0
Balance (in shares) at Dec. 31, 2016   43,569,000      
Net income 65,077 $ 0 0 65,077 0
Unrealized gain on available-for-sale marketable debt securities, net of tax 0        
Exercise of common stock options 3,241 $ 2 3,239 0 0
Exercise of common stock options (in shares)   222,000      
Stock-based compensation 15,763 $ 6 15,757 0 0
Stock-based compensation (in shares)   594,000      
Repurchases of common stock (155,245) $ (56) (18,996) (136,193) 0
Repurchases of common stock (in shares)   (5,572,000)      
Balance at Dec. 30, 2017 $ 89,156 $ 388 0 88,768 0
Balance (in shares) at Dec. 30, 2017 38,813,000 38,813,000      
Net income $ 69,539 $ 0 0 69,539 0
Unrealized gain on available-for-sale marketable debt securities, net of tax 0        
Exercise of common stock options 2,788 $ 2 2,786 0 0
Exercise of common stock options (in shares)   186,000      
Stock-based compensation 11,412 $ 3 11,409 0 0
Stock-based compensation (in shares)   271,000      
Repurchases of common stock (282,445) $ (84) (14,195) (268,166) 0
Repurchases of common stock (in shares)   (8,402,000)      
Balance at Dec. 29, 2018 $ (109,550) $ 309 $ 0 $ (109,859) $ 0
Balance (in shares) at Dec. 29, 2018 30,868,000 30,868,000