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Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 28, 2019	Sep. 29, 2018
Earnings Per Share [Abstract]
Antidilutive securities excluded from diluted shares calculation (in shares)	114			0			0	100
Net loss	$ (7,043)	$ 6,301	$ (6,719)	$ (9,896)	$ (8,558)	$ (13,427)	$ (7,461)	$ (31,881)
Weighted-average shares outstanding - basic (in shares)	9,366			9,274			9,351	9,209
Dilutive effect of share-based awards (in shares)	0			0			0	0
Weighted-average shares outstanding - diluted (in shares)	9,366			9,274			9,351	9,209
Basic loss per share (in dollars per share)	$ (0.75)			$ (1.07)			$ (0.80)	$ (3.46)
Diluted loss per share (in dollars per share)	$ (0.75)			$ (1.07)			$ (0.80)	$ (3.46)

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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