v3.8.0.1
Segment and Geographical Information - Segment Reporting Information by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Segment Reporting Information [Line Items]    
Revenue [1] $ 47,325 $ 43,366
United States    
Segment Reporting Information [Line Items]    
Revenue 42,537 39,842
Non-US    
Segment Reporting Information [Line Items]    
Revenue $ 4,788 $ 3,524
[1] (1) Includes related party revenue of $637 and $392 for the three months ended March 31, 2018 and April 1, 2017, respectively. (Note 14)