Other Assets, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Less accumulated amortization	$ (5,065)	$ (5,036)
Intangible assets, net	910	939
Inventory, non-current	500	460
Other assets	1,615	1,740
Intangible and other assets	3,025	3,139
Capitalized patent and license costs
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 5,975	$ 5,975