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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 29, 2012 | Dec. 31, 2011 | Jan. 01, 2011
Activity in stock option plan |  |  |
Shares Available for Grant, Beginning Balance | 505,221 | 760,137 | 862,157
Outstanding, Number of Shares, Beginning Balance | 1,766,401 | 1,618,066 | 1,583,508
Aggregate Price, Beginning Balance | $ 6,380 | $ 5,906 | $ 6,169
Weighted Average Exercise Price, Beginning Balance | $ 3.61 | $ 3.65 | $ 3.91
Shares Available for Grant, Additional shares reserved | 324,501 | 63,063 | 93,299
Shares Available for Grant, Options granted | (335,050) | (319,900) | (195,800)
Number of Shares, Options granted | 335,050 | 319,900 | 195,800
Aggregate Price, Options Granted | 1,313 | 1,148 | 780
Weighted Average Exercise Price, Options granted | $ 3.92 | $ 3.59 | $ 3.98
Number of shares, Options exercised | (174,631) | (99,291) | (34,558)
Shares Available for Grant, Options exercised | 0 | 0 | 0
Aggregate Price, Options Exercised | (445) | (321) | (88)
Weighted Average Exercise Price, Options exercised | $ 2.55 | $ 3.24 | $ 2.54
Shares Available for Grant, Options cancelled | 356,277 | 72,274 | 126,684
Number of Shares, Options cancelled | (356,277) | (72,274) | (126,684)
Aggregate Price, Options cancelled | (1,550) | (353) | (955)
Weighted Average Exercise Price, Options cancelled | $ 4.35 | $ 4.88 | $ 7.54
Shares Available for Grant, Options expired | (108,971) | (70,353) | (126,203)
Number of Shares, Options expired | 0 | 0 | 0
Aggregate Price, Options expired | 0 | 0 | 0
Weighted Average Exercise Price, Options expired | $ 0.00 | $ 0.00 | $ 0.00
Shares Available for Grant, Ending Balance | 741,978 | 505,221 | 760,137
Number of Shares, Ending Balance | 1,570,543 | 1,766,401 | 1,618,066
Aggregate Price, Ending Balance | $ 5,698 | $ 6,380 | $ 5,906
Weighted Average Exercise Price, Ending Balance | $ 3.63 | $ 3.61 | $ 3.65

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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