Other Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Less accumulated amortization	$ (5,021)	$ (5,007)
Intangible assets, net	954	968
Inventory, non-current	1,177	2,985
Other assets	2,612	1,861
Intangible and other assets	4,743	5,814
Capitalized patent and license costs
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 5,975	$ 5,975