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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Member] |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 126 | $ 73 | $ 150
Additions to Allowance | 129 | 78 |
Charges Utilized/Write-offs | (85) | (25) | (77)
Balance at end of period | 170 | 126 | 73
Valuation Allowance for Deferred Tax Assets [Member] |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 13,702 | 10,980 | 36,786
Additions to Allowance | 470 | 2,984 | 1,643
Charges Utilized/Write-offs | (3,206) | (262) | (27,449)
Balance at end of period | $ 10,966 | $ 13,702 | $ 10,980

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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