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Loss Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Number of common stock warrant and common stock options exercised 2,106,679   24,168,461  
Number of common stock issued for stock warrant and stock options exercised 2,106,634   22,635,661  
Shares surrendered in lieu of cash payment 45   1,206,654  
Common stock investments, available for sale        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common shares 11,261,582 29,132,527 14,375,502 29,503,319