Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Adoption of ASU No. 2016-02 Leases	Common Stock		Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Deficit Adoption of ASU No. 2016-02 Leases
Beginning balance (in shares) at Jan. 01, 2019				46,353,309	[1]	2,423,871
Beginning balance at Jan. 01, 2019		$ 52,681	$ (5,992)	$ 464	[1]	$ (35,000)	$ 198,352	$ (111,135)	$ (5,992)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan transactions and other (in shares)	[1]			17,642
Stock plan transactions and other		21		$ 0	[1]		21
Stock-based compensation expense		737					737
Net loss		(1,851)						(1,851)
Ending balance (in shares) at Apr. 02, 2019				46,370,951	[1]	2,423,871
Ending balance at Apr. 02, 2019		45,596		$ 464	[1]	$ (35,000)	199,110	(118,978)
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]			25,945
Stock plan transactions and other		(1)		$ 0	[1]		(1)
Stock-based compensation expense		171					171
Net loss		(5,835)						(5,835)
Ending balance (in shares) at Mar. 31, 2020				46,583,879	[1]	2,423,871
Ending balance at Mar. 31, 2020		$ 44,906		$ 466	[1]	$ (35,000)	$ 200,755	$ (121,315)

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