Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 27, 2020	Sep. 29, 2019
Earnings Per Share, Basic [Abstract]
Net income (loss)	$ 3,531	$ 7,842	$ (22,209)	$ (6,812)	$ (3,732)	$ (11,469)	$ (10,836)	$ (22,013)
Net income (loss) available to common stockholders	$ 2,923			$ (6,812)			$ (10,836)	$ (22,013)
Weighted average common shares outstanding	50,923,686			45,947,413			50,887,182	41,014,635
Basic net income (loss) per share (in dollars per share)	$ 0.06			$ (0.15)			$ (0.21)	$ (0.54)
Diluted net income (loss) per share:
Net income (loss)	$ 3,531	$ 7,842	$ (22,209)	$ (6,812)	$ (3,732)	$ (11,469)	$ (10,836)	$ (22,013)
Weighted average common shares outstanding (in shares)	50,923,686			45,947,413			50,887,182	41,014,635
Dilutive effect of preferred stock and non-vested shares (in shares)	9,618,894			0			0	0
Shares used in computing diluted net income (loss) per share (in shares)	60,542,580			45,947,413			50,887,182	41,014,635
Diluted net income (loss) per share (in shares)	$ 0.06			$ (0.15)			$ (0.21)	$ (0.54)
Shares excluded from diluted net income (loss) per share computations (in shares)	0			9,665,597			10,582,428	12,138,687
Restricted Stock [Member]
Earnings Per Share, Basic [Abstract]
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	$ 67			$ 0			$ 0	$ 0
Preferred Stock [Member]
Earnings Per Share, Basic [Abstract]
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	$ 541			$ 0			$ 0	$ 0