Intangibles and Other Assets - Schedule of Intangibles and Other Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Intangibles And Other Assets [Abstract]
Purchased patents and other purchased intangible assets	$ 4,605	$ 4,605
Less: Accumulated amortization of purchased patents and other purchased intangibles	(4,599)	(4,579)
Purchased patents and other purchased intangible assets, net	6	26
Other assets	258	265
Intangibles and other assets, net	$ 264	291
Patents, estimated useful lives	10 years
Amortization of intangibles	$ 20	$ 67	$ 79