Income Taxes (Deferred tax assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Net operating loss carryforward	$ 11,873,000	$ 14,270,000
Research and development credits	2,809,000	2,637,000
Deferred Tax Assets, Property, Plant and Equipment	288,000	84,000
Reserves and accruals	6,060,000	4,502,000
Total deferred tax assets	21,030,000	21,493,000
Valuation allowance	(21,030,000)	(21,193,000)	(22,687,000)	(21,588,000)
Net deferred tax assets	0	300,000
Deferred tax liabilities	(216,000)	(451,000)
Net deferred tax liabilities	(216,000)	(151,000)
Deferred tax assets decrease	$ 200,000	$ 1,500,000