Income Taxes (Reconciliation of Expected Income Tax Benefit Computed Using Federal Statutory Income Tax Rate) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Examination [Line Items]
Income tax benefit based on federal statutory rate	$ (4,658,000)	$ (2,729,000)
State income tax benefit, net of federal income tax	(70,000)	(413,000)
Change in deferred tax valuation allowance	4,478,000	3,048,000
Stock-based compensation	203,000	75,000
Foreign net operating loss	0	0
Other, net	47,000	19,000
Income tax provision	$ 0	$ 0