Fair Value (Fair Value Assumptions) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Redeemable warrants		$ 0	$ 0
Risk-free interest rate, minimum	0.06%
Risk-free interest rate, maximum	0.23%
Expected volatility, minimum	69.74%
Expected volatility, maximum	113.56%
Expected dividend yield	0.00%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Underlying price per share	$ 0.19
Exercise price per share	$ 1.31
Expected holding period	4 months 17 days
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Underlying price per share	$ 0.27
Exercise price per share	$ 1.65
Expected holding period	1 year 7 months 21 days