Investments in Other Entities and Noncontrolling Interest in a Subsidiary - SAFE&CEC S.r.l. (Details) - SAFE&CEC S.r.l. - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 29, 2017
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			49.00%
Equity Method Investment, Summarized Financial Information [Abstract]
Revenue	$ 80,886	$ 68,373
Gross profit	20,525	20,124
Operating income (loss)	1,207	(4,881)
Net income (loss)	93	(5,499)
Current assets	56,765	42,568
Non-current assets	56,153	48,629
Total assets	112,918	91,197
Current liabilities	51,911	36,177
Non-current liabilities	11,952	6,955
Total liabilities	$ 63,863	$ 43,132