Segment Reporting - Income (Loss) from Operations for Business Segments and Unallocated Costs and Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Income (loss) from operations	$ (3,635)	$ (2,905)
Unallocated costs and expenses	(5,476)	(4,095)
Operating Segments [Member] | Product Sales and Services [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(1,515)	(197)
Operating Segments [Member] | Technology Licensing [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	242	(432)
Operating Segments [Member] | Technology Development [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	1,477	105
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Shared Services	(3,323)	(2,025)
Unallocated costs and expenses	$ (516)	$ (356)