Inventory - Summary of Inventory (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Raw materials | $ 3,062 | $ 3,367 |
| Work-in-process | 2,681 | 3,464 |
| Finished products | 9,462 | 9,883 |
| Total inventory | $ 15,205 | $ 16,714 |