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Summary of Significant Accounting Policies (Details Textual) $ in Thousands, shares in Millions | 12 Months Ended |
--- | --- | ---
Jan. 02, 2016 USD ($) customer shares | Dec. 27, 2014 USD ($) customer shares | Dec. 28, 2013 USD ($) shares | Dec. 29, 2012 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Capitalized Computer Software, Gross | $ 8,600 | $ 8,200 | $ 8,200 |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |  |
Number of customers with accounts receivable balance greater than 10% of total receivables | customer | 3 | 2 |  |
Percentage Of Receivables Held By Three Customers | 45.80% |  |  |
Percentage of receivables held by two customers |  | 32.20% |  |
Minimum percentage help by each customer with an accounts receivable balance greater than 10% of the total accounts receivable balance | 10.00% | 10.00% |  |
Advertising cost | $ 54,700 | $ 46,100 | $ 38,200 |
Potentially diluted shares of common stock | shares | 0.5 | 0.2 | 0.7 |
Deferred Tax Assets, Valuation Allowance | $ 0 | $ 0 | $ 2,090 | $ 2,691
Government Contracts Concentration Risk [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration Risk, Percentage | 5.10% | 4.30% | 6.20% |
Customer Concentration Risk [Member] | Government Contracts Concentration Risk [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration Risk, Percentage | 5.10% | 4.30% | 6.20% |
Customer Concentration Risk [Member] | International distributors of home robots products [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration Risk, Percentage | 26.00% | 29.80% | 33.20% |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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