Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jul. 03, 2015	Dec. 31, 2014	Jun. 27, 2014	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]
Accrued compensation and benefits	$ 8,809	$ 7,741
Accrued warranty	3,539	3,044	$ 3,416	$ 3,315
Accrued professional services	1,580	1,827
Other	8,109	6,789
Total	$ 22,037	$ 19,401