Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Accrued salaries and benefits	$ 3,637	$ 3,699
Accrued judgments and settlements	65	108
Accrued professional fees	718	257
Accrued warranty expense	314	675	$ 955	$ 484
Accrued income and other taxes	1,215	539
Other accrued expenses	2,694	3,967
Accrued liabilities	$ 8,643	$ 9,245