Summary of Significant Accounting Policies - Reconciliation of Changes in Warranty Liability (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2016		Jul. 04, 2015
Reconciliation of the changes in the Company's warranty liability
Balance, beginning of period	$ 603	[1]	$ 469
Accruals for product warranties	232		183
Cost of warranty claims and adjustments	(225)		(132)
Balance, end of period	$ 610		$ 520

[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 2, 2016.