Segment and Geographical Information - Revenue by Product Line (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 30, 2017 |
Sep. 30, 2017 |
Jul. 01, 2017 |
Apr. 01, 2017 |
Dec. 31, 2016 |
Sep. 24, 2016 |
Jun. 25, 2016 |
Mar. 26, 2016 |
Dec. 30, 2017 |
Dec. 31, 2016 |
Dec. 26, 2015 |
|
| Segment Reporting Information [Line Items] | |||||||||||
| Total revenue | $ 44,216 | $ 44,536 | $ 41,972 | $ 43,366 | $ 43,513 | $ 40,791 | $ 38,184 | $ 39,266 | $ 174,090 | $ 161,754 | $ 138,681 |
| U.S. Consumer Business | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Total revenue | 137,918 | 130,327 | 115,020 | ||||||||
| Other | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Total revenue | $ 36,172 | $ 31,427 | $ 23,661 | ||||||||