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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jan. 02, 2016 | Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Income Taxes [Line Items] |  |  |  |
Accrued interest and penalties | $ 0 |  |  |
Ending balance of unrecognized tax benefits | 937,000 | $ 861,000 | $ 1,027,000 | $ 954,000
Unrecognized tax benefits recognition impact on income tax rate | $ 937,000 |  |  |
Earliest Tax Year |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open Tax Year | 2009 |  |  |
Latest Tax Year |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open Tax Year | 2015 |  |  |
Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss | $ 12,700,000 |  |  |
Stock option deduction | $ 2,600,000 |  |  |
Net operating loss expiration year | 2032 |  |  |
Research & development credit | $ 1,400,000 |  |  |
Tax credit carryforward expiration year | 2026 |  |  |
State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss | $ 14,500,000 |  |  |
Stock option deduction | $ 2,300,000 |  |  |
Net operating loss expiration year | 2020 |  |  |
Research & development credit | $ 2,100,000 |  |  |

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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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