Sales, Operating Loss and Total Assets Attributable to Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Total Sales:
Revenues	$ 456	$ 371
Operating loss:
Loss from operations	(685)	(769)
ASSETS
Total assets	3,206	2,543	3,882
Medical equipment
Total Sales:
Revenues	456	371
Operating loss:
Loss from operations	(482)	(582)
ASSETS
Total assets	2,722	1,629
Radiopharmaceuticals/Radioisotopes
Total Sales:
Revenues	0	0
Operating loss:
Loss from operations	(203)	(187)
ASSETS
Total assets	484	914
Unallocated
Operating loss:
Loss from operations	0	0
ASSETS
Total assets	$ 0	$ 0