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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Income Taxes [Line Items] |  |  |
Accrued interest and penalty | $ 0 |  |
Ending balance of unrecognized tax benefits | 1,192,000 | $ 1,155,000 | $ 1,105,000
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 | 2019 |  |
Federal |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss | $ 41,900,000 |  |
Net operating loss expiration year | 2033 |  |
Federal | Research Tax Credit Carryforward |  |  |
Income Taxes [Line Items] |  |  |
Research credit | $ 2,000,000 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss | $ 24,200,000 |  |
Net operating loss expiration year | 2021 |  |
State | Research Tax Credit Carryforward |  |  |
Income Taxes [Line Items] |  |  |
Research credit | $ 2,800,000 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -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://fasb.org/us-gaap/role/ref/legacyRef -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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