Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 29, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Accrued compensation and benefits	$ 16,631	$ 9,647
Accrued warranty	4,773	3,142	$ 3,300	$ 3,335
Accrued restructuring	575	1,371
Accrued professional services	1,854	1,237
Accrued contingent considerations	2,800	2,775
Customer deposits	3,294	1,164
Other	11,013	7,612
Total	$ 40,940	$ 26,948