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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Commitments And Contingencies Disclosure [Line Items] |  |  |
Operating Leases, Rent Expense | $ 7,488,000 | $ 6,712,000 | $ 6,478,000
Purchase Obligation | 12,315,000 |  |
Construction of Office and Laboratory [Member] |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Contractual Obligation | $ 11,769,000 |  |

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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