CONSOLIDATED STATEMENTS OF EQUITY (DEFICIT) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in stockholders equity
Adoption of new accounting standard	$ (76,231)		$ 815	$ 219,095	$ (296,184)		$ 43
Balance at beginning of the period (in shares) at Dec. 30, 2017			81,535
Balance at beginning of the period at Dec. 30, 2017	(76,231)		$ 815	219,095	(296,184)		43
Increase (decrease) in stockholders equity
Issuance of common stock upon initial public offering, net of offering costs (in shares)			2,500
Issuance of common stock upon initial public offering, net of offering costs	37,774		$ 25	37,749
Stock-based compensation	13,247			13,247
Common stock issued under employee benefit plans (in shares)			560
Common stock issued under employee benefit plans	262		$ 6	256
Common stock withheld related to net share settlement of stock-based compensation (in shares)			(2)
Common stock withheld related to net share settlement of stock-based compensation	(57)			(57)
Repurchase of common stock (in shares)			(397)
Repurchase of common stock	(1,967)		$ (4)	(1,963)
Adoption of new accounting standard	28,971	$ 500	$ 842	268,327	(240,104)	$ 500	(94)
Dividends	(1,683)				(1,683)
Other comprehensive income (loss)	(137)						(137)
Net income	57,763				57,763
Balance at end of the period (in shares) at Dec. 29, 2018			84,196
Balance at end of the period at Dec. 29, 2018	28,971	500	$ 842	268,327	(240,104)	500	(94)
Increase (decrease) in stockholders equity
Adoption of new accounting standard	28,971	500	$ 842	268,327	(240,104)	500	(94)
Stock-based compensation	52,332			52,332
Common stock issued under employee benefit plans (in shares)			3,023
Common stock issued under employee benefit plans	3,561		$ 30	3,531
Common stock withheld related to net share settlement of stock-based compensation (in shares)			(445)
Common stock withheld related to net share settlement of stock-based compensation	(13,516)		$ (4)	(13,512)
Adoption of new accounting standard	122,005	$ 500	$ 868	310,678	(189,545)	$ 500	4
Dividends	(375)				(375)
Other comprehensive income (loss)	98						98
Net income	50,434				50,434
Balance at end of the period (in shares) at Dec. 28, 2019			86,774
Balance at end of the period at Dec. 28, 2019	122,005		$ 868	310,678	(189,545)		4
Increase (decrease) in stockholders equity
Adoption of new accounting standard	122,005		$ 868	310,678	(189,545)		4
Stock-based compensation	9,009			9,009
Common stock issued under employee benefit plans (in shares)			383
Common stock issued under employee benefit plans	3,022		$ 4	3,018
Common stock withheld related to net share settlement of stock-based compensation (in shares)			(29)
Common stock withheld related to net share settlement of stock-based compensation	(1,028)		$ (1)	(1,027)
Adoption of new accounting standard	288,418		$ 871	321,678	(33,744)		(387)
Other comprehensive income (loss)	(391)						(391)
Net income	155,801				155,801
Balance at end of the period (in shares) at Jan. 02, 2021			87,128
Balance at end of the period at Jan. 02, 2021	288,418		$ 871	321,678	(33,744)		(387)
Increase (decrease) in stockholders equity
Adoption of new accounting standard	$ 288,418		$ 871	$ 321,678	$ (33,744)		$ (387)