Share-Based Compensation (Details 1)	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Share Based Compensation [Line Items]
Expected volatility	105.37%		102.01%
Risk-free interest rate	1.01%		0.92%
Expected term of option	5 years 9 months 4 days		5 years 7 months 17 days
Forfeiture rate	5.00%	[1]	5.00%	[1]
Expected dividend yield	0.00%		0.00%

[1] Authoritative guidance requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. During the six- month periods ended June 30, 2013 and 2012, forfeitures were estimated at 5%.