Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2019	Jun. 26, 2018	Jun. 25, 2019	Jun. 26, 2018
Earnings Per Share [Abstract]
Net loss	$ (6,398)	$ (1,562)	$ (24,725)	$ (1,162)
Shares:
Weighted-average common shares outstanding - basic (in shares)	33,417	20,377	33,387	20,347
Effect of dilutive shares (in shares)	0	0	0	0
Weighted-average common shares outstanding - diluted (in shares)	33,417	20,377	33,387	20,347
Loss per share - basic (in dollars per share)	$ (0.19)	$ (0.08)	$ (0.74)	$ (0.06)
Loss per share - diluted (in dollars per share)	$ (0.19)	$ (0.08)	$ (0.74)	$ (0.06)