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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016 | Dec. 22, 2017 | Dec. 31, 2015 | Jan. 03, 2015
Income Taxes [Line Items] |  |  |  |  |  |  |
Refundable AMT and adjustment to indefinite-lived deferred tax liability |  |  |  |  | $ 90,000 |  |
Corporate federal income tax rate |  | 34.00% | 34.00% | 34.00% |  |  |
Accrued interest and penalty |  | $ 0 |  |  |  |  |
Ending balance of unrecognized tax benefits |  | 1,105,000 | $ 1,029,000 | $ 937,000 |  |  | $ 861,000
Unrecognized tax benefits recognition impact on income tax rate |  | $ 0 |  |  |  |  |
Earliest Tax Year |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Open Tax Year |  | 2010 |  |  |  |  |
Latest Tax Year |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Open Tax Year |  | 2016 |  |  |  |  |
Scenario Forecast |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Corporate federal income tax rate | 21.00% |  |  |  |  |  |
Federal |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss |  | $ 21,500,000 |  |  |  |  |
Net operating loss expiration year |  | 2032 |  |  |  |  |
Research credit |  |  |  |  |  | $ 1,800,000 |
State |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss |  | $ 16,700,000 |  |  |  |  |
Net operating loss expiration year |  | 2020 |  |  |  |  |
Research credit |  |  |  |  |  | $ 2,600,000 |

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- Definition Tax cuts and jobs act of 2017 deferred tax assets tax credit carryforwards alternative minimum tax. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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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=84230637&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=84230637&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=84230637&loc=d3e32559-109319 + Details
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- Definition Amount of unrecognized tax benefits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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