Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Accrued salaries and benefits	$ 2,957	$ 3,699
Accrued judgments and settlements	65	108
Accrued professional fees	330	257
Accrued warranty expense	401	675	$ 826	$ 955
Accrued income and other taxes	712	539
Other accrued expenses	2,203	3,967
Accrued liabilities	$ 6,668	$ 9,245