Summary of Significant Accounting Policies - Reconciliation of Changes in Warranty Liability (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014		Sep. 28, 2013
Reconciliation of the changes in the Company's warranty liability
Balance, beginning of period	$ 468	[1]	$ 453
Accruals for product warranties	207		162
Cost of warranty claims and adjustments	(137)		(143)
Balance, end of period	$ 538		$ 472

[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 December 28, 2013.