Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Sep. 29, 2019	Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ (6,812)	$ (3,732)	$ (11,469)	$ 3,611	$ 7,788	$ (3,102)	$ (22,013)	$ 8,297
Basic	45,947,413			35,735,680			41,014,635	35,707,245
Weighted Average Number Diluted Shares Outstanding Adjustment	0			9,674,876			0	9,586,010
Basic net income (loss) per share	$ (0.15)			$ 0.08			$ (0.54)	$ 0.18
Diluted	45,947,413			45,410,556			41,014,635	45,293,255
Diluted net income (loss) per share	$ (0.15)			$ 0.08			$ (0.54)	$ 0.18
Shares excluded from diluted net loss per share computations	9,665,597			0			12,138,687	0
Net Income (Loss) Available to Common Stockholders, Basic	$ (6,812)			$ 2,808			$ (22,013)	$ 6,449
Restricted Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	0			63			0	147
Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	$ 0			$ 740			$ 0	$ 1,701