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Industry Segment, Geographic Information and Significant Customers - Additional Information (Detail) - Customer Concentration Risk [Member] | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Retail Site [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration Risk, Percentage | 11.00% |  | 11.90% |
Customer Concentration Risk [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration Risk, Percentage | 57.30% | 60.90% | 51.50% | 62.40%
International distributors of home robots products | Distributor One |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 13.30% |  | 13.50%
International distributors of home robots products | Distributor Two |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration Risk, Percentage | 14.30% | 12.00% | 13.20% | 13.10%

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