Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Common Stock		Treasury Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019			46,557,934	[1]	2,423,871
Beginning balance at Dec. 31, 2019		$ 50,571	$ 466	[1]	$ (35,000)	$ 200,585	$ (115,480)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan transactions and other (in shares)	[1]		237,600
Stock plan transactions and other		(223)	$ 2	[1]		(225)
Stock-based compensation expense		1,954				1,954
Net income (loss)		(19,440)					(19,440)
Ending balance (in shares) at Sep. 29, 2020			46,795,534	[1]	2,423,871
Ending balance at Sep. 29, 2020		32,862	$ 468	[1]	$ (35,000)	202,314	(134,920)
Beginning balance (in shares) at Jun. 30, 2020			46,778,682	[1]	2,423,871
Beginning balance at Jun. 30, 2020		32,276	$ 468	[1]	$ (35,000)	201,601	(134,793)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan transactions and other (in shares)	[1]		16,852
Stock plan transactions and other		49	$ 0	[1]		49
Stock-based compensation expense		664				664
Net income (loss)		(127)					(127)
Ending balance (in shares) at Sep. 29, 2020			46,795,534	[1]	2,423,871
Ending balance at Sep. 29, 2020		32,862	$ 468	[1]	$ (35,000)	202,314	(134,920)
Beginning balance (in shares) at Dec. 29, 2020			46,807,587	[1]	2,423,871
Beginning balance at Dec. 29, 2020		29,699	$ 468	[1]	$ (35,000)	202,970	(138,739)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
L Catterton warrants exercised (in shares)	[1]		975,458
L Catterton warrants exercised		0	$ 10	[1]		(10)
Stock plan transactions and other (in shares)	[1]		282,871
Stock plan transactions and other		(481)	$ 3	[1]		(484)
Stock-based compensation expense		3,481				3,481
Net income (loss)		8,403					8,403
Ending balance (in shares) at Sep. 28, 2021			48,065,916	[1]	2,423,871
Ending balance at Sep. 28, 2021		41,102	$ 481	[1]	$ (35,000)	205,957	(130,336)
Beginning balance (in shares) at Jun. 29, 2021			48,011,761	[1]	2,423,871
Beginning balance at Jun. 29, 2021		35,443	$ 480	[1]	$ (35,000)	204,996	(135,033)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan transactions and other (in shares)	[1]		54,155
Stock plan transactions and other		(202)	$ 1	[1]		(203)
Stock-based compensation expense		1,164				1,164
Net income (loss)		4,697					4,697
Ending balance (in shares) at Sep. 28, 2021			48,065,916	[1]	2,423,871
Ending balance at Sep. 28, 2021		$ 41,102	$ 481	[1]	$ (35,000)	$ 205,957	$ (130,336)

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