Income Taxes - Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Net deferred tax assets (liability):
Deferred tax assets—non-current	$ 7	$ 145
Deferred tax liability	(23)	(97)
Net deferred tax liability	$ (16)
Net deferred tax assets		$ 48