Fair Value of Financial Instruments (Schedule of assumptions used to calculate fair value liabilities) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Warrants To Purchase Common Stock [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Volatility (as a percent)	80.00%
Stock Price (in dollars per share)	$ 6.43
Dividend Yield (as a percent)	0.00%
Warrants To Purchase Common Stock [Member] | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Exercise Price (in dollars per share)	$ 4
Term	7 years 2 months 12 days
Risk-Free Rate (as a percent)	2.10%
Warrants To Purchase Common Stock [Member] | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Exercise Price (in dollars per share)	$ 5
Term	8 years 6 months
Risk-Free Rate (as a percent)	2.30%
Interest Make-Whole Liability [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Volatility (as a percent)	45.00%
Stock Price (in dollars per share)	$ 6.43
Credit spread (as a percent)	1.335%
Term	4 years
Dividend Yield (as a percent)	0.00%