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Loss Per Share (Details)	3 Months Ended
Loss Per Share (Details)	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of common stock warrant and common stock options exercised	21,735,636
Number of common stock issued for stock warrant and stock options exercised	20,529,027
Shares surrendered in lieu of cash payment	1,206,609
Common stock investments, available for sale
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares	17,489,421	29,874,112

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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