Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 29, 2018 |
Sep. 30, 2017 |
Apr. 01, 2017 |
Sep. 29, 2018 |
Sep. 30, 2017 |
Jul. 01, 2017 |
|
| Related Party Transaction [Line Items] | ||||||
| Selling and marketing expenses | $ 2,912 | $ 3,655 | $ 8,565 | $ 11,475 | ||
| Director | ||||||
| Related Party Transaction [Line Items] | ||||||
| Related party expenses | $ 1,400 | |||||
| Selling and marketing expenses | $ 600 | |||||
| Selling and marketing | ||||||
| Related Party Transaction [Line Items] | ||||||
| Selling and marketing expenses | $ 1,200 | |||||