Sales, Operating Loss and Total Assets Attributable to Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Total Sales:
Revenues	$ 328	$ 355	$ 674	$ 811
Operating loss:
Loss from operations	(223)	(707)	(754)	(1,392)
Total assets:
Total assets	1,642	2,339	1,642	2,339	$ 1,869
Medical equipment
Total Sales:
Revenues	328	355	674	811
Operating loss:
Loss from operations	(102)	(547)	(486)	(1,028)
Total assets:
Total assets	1,273	1,878	1,273	1,878
Radiopharmaceuticals
Total Sales:
Revenues	0	0	0	0
Operating loss:
Loss from operations	(121)	(160)	(268)	(364)
Total assets:
Total assets	369	461	369	461
Unallocated
Operating loss:
Loss from operations	0	0	0	0
Total assets:
Total assets	$ 0	$ 0	$ 0	$ 0