Warrants (Details) - Fair values estimation assumptions (Warrant [Member])	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Warrant [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Risk-free interest rate	0.07% - 0.15%	0.15% - 0.22%
Expected remaining term	0.71 - 1.23 Years	0.64 - 1.79 Years
Expected volatility	99.23% - 112.18%	106.78% - 122.48%
Dividend yield	0.00%	0.00%