Warrants (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Weighted-average assumptions for used for valuing warrants
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Shares underlying warrants classified as liabilities	4,784,519	4,824,827	4,784,519	4,824,827
Market value of stock at beginning of year	$ 4.50	$ 12.72	$ 4.50	$ 12.72
Market value of stock at end of period	$ 15.53	$ 6.72	$ 15.53	$ 6.72
Maximum [Member]
Weighted-average assumptions for used for valuing warrants
Risk-free interest rate	0.30%	1.30%	0.30%	1.30%
Expected lives	1 year 10 months 24 days	3 years 4 months 24 days	1 year 10 months 24 days	3 years 4 months 24 days
Expected volatility	209.10%	88.50%	209.10%	88.50%
Minimum [Member]
Weighted-average assumptions for used for valuing warrants
Risk-free interest rate	0.10%	0.10%	0.10%	0.10%
Expected lives	2 months 12 days	1 year 2 months 12 days	2 months 12 days	1 year 2 months 12 days
Expected volatility	100.70%	55.30%	100.70%	55.30%