Summary of Significant Accounting Policies - Schedule of Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Revenues [Line Items]
Revenue, percent	100.00%		100.00%
Revenue	$ 89,146	$ 100,408	$ 176,095	$ 197,646
Year-over-Year Change	(11.20%)		(10.90%)
Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member]
Revenues [Line Items]
Revenue, percent		100.00%		100.00%
North America [Member]
Revenues [Line Items]
Revenue, percent	55.40%		56.60%
Revenue	$ 49,357	$ 62,653	$ 99,664	$ 122,088
Year-over-Year Change	(21.20%)		(18.40%)
North America [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member]
Revenues [Line Items]
Revenue, percent		62.40%		61.80%
Europe [Member]
Revenues [Line Items]
Revenue, percent	44.60%		43.40%
Revenue	$ 39,789	$ 37,755	$ 76,431	$ 75,558
Year-over-Year Change	5.40%		1.20%
Europe [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member]
Revenues [Line Items]
Revenue, percent		37.60%		38.20%