v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Sep. 29, 2018
Oct. 29, 2018
Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 29, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Trading Symbol IRBT  
Entity Registrant Name IROBOT CORP  
Entity Central Index Key 0001159167  
Current Fiscal Year End Date --12-29  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   27,686,749