Income Taxes (Narrative) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Net operating loss carryforwards ("NOLs")	$ 182,300,000
Operating loss carryforward, expiration date	Dec. 31, 2019
Interest and penalties pertaining to income tax examination recognized	$ 0	$ 0
Maximum [Member]
Income tax examination, years under examination	2015
Minimum [Member]
Income tax examination, years under examination	1998
Domestic Tax Authority [Member]
Tax credit carryforward, expiration date	Dec. 31, 2019
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax credit carryforward	$ 5,200,000
Foreign Tax Authority [Member]
Net operating loss carryforwards ("NOLs")	8,500,000
Tax Year 2015 [Member] | Foreign Tax Authority [Member]
Net operating loss carryforwards ("NOLs")	$ 3,000,000