Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 1,905	$ 733
Assets held-for-sale	1,900		$ 1,000
Cost of goods sold
Property, Plant and Equipment [Line Items]
Depreciation and amortization	1,400	600
Research and development expense
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 500	$ 100