Accrued Expenses and Other Payables (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Engineering accruals	$ 466	$ 807
Professional fees	583	642
Government grants	263	288
Income taxes payable, net	1,489	830
Other	1,214	1,066
Accrued expenses and other payables	$ 4,015	$ 3,633