Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Common Stock		Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings (Accumulated Deficit)	Preferred stock and warrants	Preferred stock and warrants Additional Paid-In Capital	Common stock	Common stock Common Stock		Common stock Additional Paid-In Capital
Beginning balance (in shares) at Jan. 03, 2017			30,300,925	[1],[2]	2,423,871
Beginning balance at Jan. 03, 2017		$ 25,818	$ 303	[1],[2]	$ (35,000)	$ 124,272	$ (51)	$ (63,706)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock (in shares)	[1],[2]											8,873,240
Issuance of stock									$ 6,056	$ 6,056	$ 29,110	$ 89	[1],[2]	$ 29,021
Accretion of preferred stock		7,967				7,967
Conversion of preferred stock to L Catterton (in shares)	[1],[2]		4,252,873
Conversion of preferred stock to L Catterton		18,500	$ 43	[1],[2]		18,457
Stock plan transactions and other (in shares)	[1],[2]		123,291
Stock plan transactions and other		83	$ 1	[2]		82
Stock-based compensation expense		1,692				1,692
Net income (loss)		(37,482)						(37,482)
Other comprehensive income (loss)		51					51
Ending balance at Jan. 02, 2018		35,861	$ 436	[1],[2]	$ (35,000)	171,613	0	(101,188)
Ending balance (in shares) at Jan. 02, 2018			43,550,329	[1],[2]	2,423,871
Beginning balance at Jan. 03, 2017		0
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of preferred stock and warrants to L Catterton in connection with the private placement, net of transaction expenses		10,533
Accretion of preferred stock		7,967
Conversion of preferred stock to L Catterton		(18,500)
Ending balance at Jan. 02, 2018		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock (in shares)	[1],[2]											2,500,000
Issuance of stock											$ 22,992	$ 25	[1],[2]	$ 22,967
Stock plan transactions and other (in shares)	[1],[2]		302,980
Stock plan transactions and other		749	$ 3	[2]		746
Stock-based compensation expense		3,026				3,026
Net income (loss)		(8,441)						(8,441)
Ending balance at Jan. 01, 2019		52,681	$ 464	[1],[2]	$ (35,000)	198,352	0	(111,135)
Ending balance (in shares) at Jan. 01, 2019			46,353,309	[1],[2]	2,423,871
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan transactions and other (in shares)	[1],[2]		204,625
Stock plan transactions and other		(252)	$ 2	[2]		(254)
Stock-based compensation expense		2,487				2,487
Net income (loss)		1,647						1,647
Ending balance at Dec. 31, 2019		$ 50,571	$ 466	[1],[2]	$ (35,000)	$ 200,585	$ 0	$ (115,480)
Ending balance (in shares) at Dec. 31, 2019			46,557,934	[1],[2]	2,423,871

[1] 1,522,098 shares of Class B common stock

[2] Unless otherwise noted, activity relates to Class A common stock