Supplementary Balance Sheet Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Inventory, Net [Abstract]
Raw materials	$ 2,439,000	$ 2,619,000
Work-in-process	2,560,000	3,189,000
Finished goods	558,000	616,000
Total inventories	5,557,000	6,424,000
Less reserve for excess and obsolete inventories	(1,913,000)	(2,543,000)
Total inventories, net	3,644,000	3,881,000
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	26,900,000	25,954,000
Less accumulated depreciation	(22,134,000)	(21,801,000)
Total property and equipment, net	4,766,000	4,153,000
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets, gross	5,661,000	3,081,000
Accumulated amortization	(3,084,000)	(2,728,000)
Finite-Lived Intangible Assets, Net	2,577,000	353,000
Amortization of intangible assets	356,000	231,000	233,000
2015	400,000
2016	400,000
2017	400,000
2018	300,000
2019	300,000
Accrued Liabilities, Current [Abstract]
Professional fees	333,000	367,000
Sales and property taxes payable	197,000	275,000
Radiopharmaceuticals and consumable medical supplies	177,000	242,000
Current portion of capital lease obligation	348,000	174,000
Facilities and related costs	155,000	151,000
Outside services and consulting	151,000	134,000
Legal reserve	0	50,000
Other accrued liabilities	428,000	381,000
Total other current liabilities	1,789,000	1,774,000
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	800,000
Leasehold Improvements
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	571,000	861,000
Computer hardware and software
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	2,917,000	2,497,000
Machinery and Equipment
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	23,412,000	22,596,000
Customer Relationships
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Weighted average useful life	8 years 7 months 6 days	5 years 3 months 18 days
Intangible assets, gross	4,850,000	2,940,000
Accumulated amortization	(2,904,000)	(2,622,000)
Finite-Lived Intangible Assets, Net	1,946,000	318,000
Trademarks
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Weighted average useful life	9 years
Intangible assets, gross	600,000
Accumulated amortization	(53,000)
Finite-Lived Intangible Assets, Net	547,000
Noncompete Agreements
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Weighted average useful life	5 years
Intangible assets, gross	70,000
Accumulated amortization	(11,000)
Finite-Lived Intangible Assets, Net	59,000
Patents
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Weighted average useful life	13 years 2 months 12 days	12 years 7 months 6 days
Intangible assets, gross	141,000	141,000
Accumulated amortization	(116,000)	(106,000)
Finite-Lived Intangible Assets, Net	$ 25,000	$ 35,000