Summary of Significant Accounting Policies - Reconciliation of Changes in Warranty Liability (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2016		Oct. 03, 2015
Reconciliation of the changes in the Company's warranty liability
Balance, beginning of period	$ 603	[1]	$ 469
Accruals for product warranties	318		267
Cost of warranty claims and adjustments	(351)		(208)
Balance, end of period	$ 570		$ 528

[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.