Accrued Liabilities - Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Payables And Accruals [Abstract]
Accrued salaries and benefits	$ 2,328	$ 2,415
Accrued judgments and settlements	3,350	2,090
Accrued warranty expense	955	484	427	646
Accrued income and other taxes	233	296
Other accrued expenses	1,974	1,780
Accrued liabilities	$ 8,840	$ 7,065