Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 29, 2013	Dec. 30, 2012
Statement Of Financial Position [Abstract]
Allowances on accounts receivable	$ 12	$ 16
Redeemable convertible preferred stock, par value	$ 0.01	$ 0.01
Redeemable convertible preferred stock, authorized	17,183,632	17,183,632
Redeemable convertible preferred stock, issued	16,086,375	16,086,375
Redeemable convertible preferred stock, outstanding	16,086,375	16,086,375
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	35,500,000	35,500,000
Common stock, issued	4,351,869	4,233,977
Common stock, outstanding	4,351,869	4,233,977

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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Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

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