Stock Option Plans (Summary of Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Number of Shares
Outstanding, beginning balance	1,870,846	1,995,280
Granted	1,039,200	557,250
Exercised		(3,126)
Expired	(824,023)	(170,375)
Forfeited	(336,713)	(508,183)
Outstanding, ending balance	1,749,310	1,870,846	1,995,280
Exercisable, December 31, 2012	757,078
Weighted Average Exercise Price
Outstanding, beginning balance	$ 3.67	$ 4.2
Granted	$ 1.35	$ 1.96
Exercised		$ 1.35
Expired	$ 4.77	$ 7.64
Forfeited	$ 1.84	$ 2.42
Outstanding, ending balance	$ 2.12	$ 3.67	$ 4.2
Exercisable, December 31, 2012	$ 3.08
Remaining Contractual Life (Years)
Outstanding, beginning balance	8 years 3 months 26 days	7 years 4 months 24 days	7 years 7 months 24 days
Granted
Exercised
Expired
Forfeited
Outstanding, ending balance	8 years 3 months 26 days	7 years 4 months 24 days	7 years 7 months 24 days
Exercisable, December 31, 2012	6 years 11 months 12 days
Aggregate Intrinsic Value
Outstanding, beginning balance	$ 66,976	$ 436,791
Granted
Exercised
Expired
Forfeited
Outstanding, ending balance	151,919	66,976	436,791
Exercisable, December 31, 2012	$ 17,897