Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Summary of inventories

	June 30, 2018			December 30, 2017
Raw materials	$	30,369		$	26,426
Work in process		33,874			6,910
Finished goods		15,647			9,920
Provision for slow moving inventory		(2,601	)		(1,711	)
Total	$	77,289		$	41,545