Sales, Operating Loss and Total Assets Attributable to Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Total Sales:
Revenues	$ 346	$ 456
Operating loss:
Loss from operations	(531)	(685)
Total assets:
Total assets	1,685	3,206	1,869
Medical equipment
Total Sales:
Revenues	346	456
Operating loss:
Loss from operations	(384)	(482)
Total assets:
Total assets	1,289	2,722
Radiopharmaceuticals
Total Sales:
Revenues	0	0
Operating loss:
Loss from operations	(147)	(203)
Total assets:
Total assets	396	484
Unallocated
Operating loss:
Loss from operations	0	0
Total assets:
Total assets	$ 0	$ 0