Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Accounts payable	$ 2,614	$ 2,671
Accrued liabilities:
Employee benefits	7,644	7,652
Customer tooling	346	320
Taxes other than on income	300	253
Insurance	233	244
Professional	219	75
Sales rebates	140	96
Other	386	307
Total	$ 11,882	$ 11,618