Taxation - Schedule of Movement of Valuation Allowance (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Taxation [Abstract] | |||
| Beginning balance | $ (291) | $ (43) | |
| Additions | $ (4,268) | $ (291) | |
| Write-off | $ 43 | ||
| Ending balance | $ (4,559) | $ (291) | |