Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 02, 2015	Dec. 31, 2014	Sep. 26, 2014	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]
Accrued compensation and benefits	$ 8,602	$ 7,741
Accrued warranty	3,529	3,044	$ 3,223	$ 3,315
Accrued professional services	1,332	1,827
Other	8,431	6,789
Total	$ 21,894	$ 19,401