Summary of Significant Accounting Policies - Schedule of Inventory (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Inventory, Net, Items Net of Reserve Alternative [Abstract] | ||
| Raw materials | $ 1,410 | $ 761 |
| Work in process | 1,840 | 1,095 |
| Finished goods | 373 | 1,345 |
| Total | $ 3,623 | $ 3,201 |