Income Taxes - Income Tax Benefit (Expense) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current taxes:
Federal current taxes	$ (79)	$ (24)
State and local current taxes	(1)	38
Foreign current taxes	(42)	41
Total current taxes	(122)	55
Deferred taxes:
Foreign deferred taxes	(27)	86
Total deferred taxes	(27)	86
Total Income tax expense (benefit)	$ (149)	$ 141