Quarterly report pursuant to Section 13 or 15(d)

Loss Per Share (Details)

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Loss Per Share (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Number of common stock warrant and common stock options exercised 1,102,741   1,705,406  
Number of common stock issued for stock warrant and stock options exercised 782,324   1,310,250  
Shares surrendered in lieu of cash payment 320,417   395,156  
Common stock investments, available for sale
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common shares 29,132,527 29,701,838 29,503,319 29,910,492