Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Computed ''expected" tax benefit - Federal	$ (5,803)	$ (2,618)
Computed "expected" tax benefit - State	(676)	(448)
Meals, entertainment and other	5	5
Non-deductible stock-based compensation	518	366
Warrant expense	0	562
Change in fair value of warrant expense	0	91
Realized loss on debt securities	0	7
Change in valuation allowance	5,956	2,035
Expected tax expense	$ 0	$ 0