Segment and Geographical Information - Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands |
3 Months Ended | ||||
|---|---|---|---|---|---|
Apr. 01, 2017 |
Mar. 26, 2016 |
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| Segment Reporting Information [Line Items] | |||||
| Revenue | $ 43,366 | $ 39,266 | [1] | ||
| United States | |||||
| Segment Reporting Information [Line Items] | |||||
| Revenue | 39,842 | 35,911 | |||
| Non-US | |||||
| Segment Reporting Information [Line Items] | |||||
| Revenue | $ 3,524 | $ 3,355 | |||
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