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Stockholders' Equity (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011 | Jan. 01, 2011
Stock options outstanding, exercisable and expected to vest |  |  |  |
Options outstanding, Number of Shares | 1,102,842 | 1,570,543 | 1,766,401 | 1,618,066
Options outstanding, Weighted Average Exercise Price | $ 3.97 | $ 3.63 | $ 3.61 | $ 3.65
Options outstanding, Weighted Average Remaining Contractual Life (years) | 3 years 7 months 13 days |  |  |
Options outstanding, Aggregate Intrinsic Value | $ 6,287 |  |  |
Options vested and expected to vest, Number of Shares | 1,042,611 |  |  |
Options vested and expected to vest, Weighted Average Exercise Price | $ 3.93 |  |  |
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years) | 3 years 5 months 23 days |  |  |
Options vested and expected to vest, Aggregate Intrinsic Value | 5,981 |  |  |
Options exercisable, Number of Shares | 701,524 |  |  |
Options exercisable, Weighted Average Exercise Price | $ 3.69 |  |  |
Options exercisable, Weighted Average Remaining Contractual Life (years) | 2 years 3 months 29 days |  |  |
Options exercisable, Aggregate Intrinsic Value | $ 4,196 |  |  |

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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