Basis of Presentation (Details Textuals) (Common stock warrants)	1 Months Ended	6 Months Ended	12 Months Ended
	May 31, 2011	Jun. 30, 2012	Dec. 31, 2011
Common stock warrants
Class of Warrant or Right [Line Items]
Risk-free interest rate	0.75%	0.34%	0.33%
Percentage of volatility of the market price of common stock	94.40%	77.30%	78.60%
Expected average term of the warrant used		2 years 6 months
Method used to calculate fair value of warrants		Black-Scholes pricing model