Income Taxes (Schedule of Deferred Tax Assets and Deferred Tax Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Domestic net operating loss carryforwards	$ 15,627,000	$ 13,669,000
Foreign net operating loss carryforwards	800,000	798,000
Deferred revenue	0	191,000
Federal and state tax credit	297,000	297,000
Stock-based compensation	682,000	586,000
Capitalized costs	1,232,000	1,233,000
Other, net	2,129,000	944,000
Total gross deferred tax assets	20,767,000	17,718,000
Less valuation allowance on deferred tax assets	(20,767,000)	(17,718,000)
Net deferred taxes	0	0
Deferred tax liabilities:
Plant and equipment, principally accelerated depreciation	0	0
Total deferred tax liabilities	0	0
Net deferred taxes	$ 0	$ 0