Summary of Significant Accounting Policies - Inventories (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Jan. 02, 2016 |
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Raw materials | $ 24,946 | $ 18,609 |
| Work in progress | 2,521 | 1,246 |
| Finished goods | 3,044 | 3,198 |
| Inventories | $ 30,511 | $ 23,053 |