Industry Segment, Geographic Information and Significant Customers - Additional Information (Detail)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments	2
Number of customer generating major revenues	2
Customer Concentration Risk [Member] | Customer Concentration Risk [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	60.80%	59.60%
Customer Concentration Risk [Member] | International distributors of home robots products | Distributor One
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	20.00%	21.90%
Customer Concentration Risk [Member] | International distributors of home robots products | Distributor Two
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	13.10%	10.20%