Other Liabilities - Summary of Other Accrued Expenses and Current Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Income taxes payable	$ 7,732	$ 3,932
Accrued VAT	3,985	4,536
Accrued royalties	3,527	2,613
Accrued professional fees	3,403	3,165
Defined contribution plan liabilities	1,225	1,376
Government grants	859	915
Non-income tax liabilities	685	853
Billings in excess of cost	520	1,504
Other current liabilities	6,043	8,145
Total	$ 27,979	$ 27,039