Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Accrued salaries and benefits	$ 2,580	$ 3,699
Accrued judgments and settlements	80	108
Accrued professional fees	228	257
Accrued warranty expense	456	675	$ 1,078	$ 955
Accrued income and other taxes	663	539
Other accrued expenses	2,598	3,967
Accrued liabilities	$ 6,605	$ 9,245