Summary of Significant Accounting Policies - Reconciliation of Changes in Warranty Liability (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 03, 2015		Sep. 27, 2014
Reconciliation of the changes in the Company's warranty liability
Balance, beginning of period	$ 469	[1]	$ 468
Accruals for product warranties	267		207
Cost of warranty claims and adjustments	(208)		(137)
Balance, end of period	$ 528		$ 538

[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended January 3, 2015.