Company Operations and Summary of Significant Accounting Policies - Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Customer incentives	$ 4,030	$ 4,729
Accrued research and development costs	773	990
Other	2,196	2,324
Total other current liabilities	$ 6,999	$ 8,043