Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Statement of Financial Position [Abstract]
Allowances for doubtful accounts	$ 253	$ 293
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	3,000,000us-gaap_PreferredStockSharesAuthorized	3,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	47,000,000us-gaap_CommonStockSharesAuthorized	47,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	23,813,729us-gaap_CommonStockSharesIssued	23,537,275us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	23,813,729us-gaap_CommonStockSharesOutstanding	23,537,275us-gaap_CommonStockSharesOutstanding

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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