Intangibles and Other Assets - Schedule of Intangibles and Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Purchased patents and other purchased intangible assets, net	$ 8
Other assets	261	$ 265
Intangibles and other assets, net	269	291
Purchased Patents and Other Purchased Intangibles
Finite-Lived Intangible Assets [Line Items]
Purchased patents and other purchased intangible assets	4,605	4,605
Less: Accumulated amortization of purchased patents and other purchased intangibles	(4,597)	(4,579)
Purchased patents and other purchased intangible assets, net	$ 8	$ 26