Other Financial Statement Data (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other Financial Statement Data [Abstract]
Depreciation expense	$ 958,000	$ 1,064,000
Weighted average life of intangible assets	2 years 3 months 18 days
Amortization expense, 2013	112,000
Amortization expense, 2014	58,000
Amortization expense, 2015	$ 19,000
Product warranties time frame, years	1 year