Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax (benefit) expense:
Domestic	$ (125)	$ (41)	$ 42
Foreign	3,294	3,062	1,856
Total income tax expense	3,169	3,021	1,898
Deferred income tax (benefit) expense:
Domestic	(3,713)	(233)	147
Foreign	1,471	(107)	(8,875)
Total income tax expense	(2,242)	(340)	(8,728)
Income tax expense (benefit)	$ 927	$ 2,681	$ (6,830)