Summary of Significant Accounting Policies - Summary of Intangible Asset, Net of Accumulated Impairment Charges (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Cost | $ 630 | $ 630 |
| Accumulated Impairment | (430) | (120) |
| Net Book Value | 200 | 510 |
| IPR&D [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Cost | 630 | 630 |
| Accumulated Impairment | (430) | (120) |
| Net Book Value | $ 200 | $ 510 |