CONSOLIDATED STATEMENTS OF EQUITY (DEFICIT) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance at beginning of the period (in shares) at Dec. 31, 2016		81,437
Balance at beginning of the period at Dec. 31, 2016	$ (95,101)	$ 814	$ 211,474	$ (309,575)	$ 0	$ 2,186
Increase (decrease) in stockholders equity
Stock-based compensation	13,393		13,393
Exercise of options (in shares)		156
Exercise of options	99	$ 1	98
Shares withheld related to net share settlement of stock-based compensation (in shares)		(58)
Shares withheld related to net share settlement of stock-based compensation	(2,018)		(2,018)
Adjustments related to the acquisition of Rambler On	(5,832)		(3,852)	(1,980)
Acquisition of noncontrolling interest	0			2,186		(2,186)
Dividends	(2,216)			(2,216)
Other comprehensive income (loss)	43				43
Net income	15,401			15,401
Balance at end of the period (in shares) at Dec. 30, 2017		81,535
Balance at end of the period at Dec. 30, 2017	(76,231)	$ 815	219,095	(296,184)	43	0
Increase (decrease) in stockholders equity
Stock-based compensation	13,247		13,247
Exercise of options (in shares)		560
Exercise of options	262	$ 6	256
Shares withheld related to net share settlement of stock-based compensation (in shares)		(2)
Shares withheld related to net share settlement of stock-based compensation	(57)		(57)
Dividends	(1,683)			(1,683)
Other comprehensive income (loss)	(137)				(137)
Net income	57,763			57,763
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
Repurchase of common stock (in shares)		(397)
Repurchase of common stock	(1,967)	$ (4)	(1,963)
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	$ 842	268,327	(240,104)	(94)	0
Increase (decrease) in stockholders equity
Stock-based compensation	52,332		52,332
Exercise of options (in shares)		3,023
Exercise of options	3,561	$ 30	3,531
Shares withheld related to net share settlement of stock-based compensation (in shares)		(445)
Shares withheld related to net share settlement of stock-based compensation	(13,516)	$ (4)	(13,512)
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	$ 0