Sales, Operating Loss and Total Assets Attributable to Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Total Sales:
Revenues	$ 351	$ 370	$ 1,154	$ 2,423
Operating loss:
Loss from operations	(736)	(803)	(2,162)	(3,746)
ASSETS
Total assets	2,478		2,478		2,685
Medical equipment
Total Sales:
Revenues	351	370	1,154	2,423
Operating loss:
Loss from operations	(541)	(768)	(1,619)	(3,100)
ASSETS
Total assets	1,596		1,596		1,739
Radiopharmaceuticals
Total Sales:
Revenues	0	0	0	0
Operating loss:
Loss from operations	(195)	(35)	(543)	(626)
ASSETS
Total assets	882		882		945
Unallocated
Operating loss:
Loss from operations	0	0	0	(20)
ASSETS
Total assets	$ 0		$ 0		$ 1