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Stockholders' Equity (Schedule of Valuation Assumptions) (Details) (USD $)
6 Months Ended 12 Months Ended
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average volatility     86.00% 86.00% 83.00%
Risk-free interest rate, minimum     0.96% 0.79% 0.79%
Risk-free interest rate, maximum     1.90% 1.18% 2.79%
Expected annual dividend yield             
Expected weighted-average life, in years     5 years 7 months 6 days 5 years 10 months 24 days 5 years 10 months 24 days
Annual dividends     $ 0    
Weight historical volitility company 100.00% 50.00%   50.00% 50.00%
Weight historical volitility comparable public companies   50.00%   50.00% 50.00%