Organization and Summary of Significant Accounting Policies - Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 30, 2017	Sep. 24, 2016
Income (loss) per common share:
Anti-dilutive options excluded from computation of diluted earnings per share (in shares)	600	500	600	500
Basic Earnings (Loss) Per Share:
Net loss from continuing operation	$ (5,472)	$ (1,731)	$ (11,653)	$ (4,937)
Net income (loss) from discontinued operations	(19,900)	(833)	(28,775)	1,077
Net loss	$ (25,372)	$ (2,564)	$ (40,428)	$ (3,860)
Weighted average number of common shares	19,790	19,671	19,735	19,634
Loss per common share (in dollars per share)	$ (1.28)	$ (0.13)	$ (2.05)	$ (0.20)
Diluted Earnings (Loss) Per Share:
Net loss from continuing operation	$ (5,472)	$ (1,731)	$ (11,653)	$ (4,937)
Net income (loss) from discontinued operations	(19,900)	(833)	(28,775)	1,077
Net loss	$ (25,372)	$ (2,564)	$ (40,428)	$ (3,860)
Weighted average number of common shares	19,790	19,671	19,735	19,634
Adjusted weighted average number of common shares	19,790	19,671	19,735	19,634
Loss per common share (in dollars per share)	$ (1.28)	$ (0.13)	$ (2.05)	$ (0.20)