Quarterly report pursuant to Section 13 or 15(d)

Stock options and warrants (Other common stock purchase options and warrants) (Narrative) (Details)

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Stock options and warrants (Other common stock purchase options and warrants) (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended
May 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Nonqualified [Member]
Sep. 30, 2012
Nonqualified [Member]
Sep. 30, 2013
Nonqualified [Member]
Sep. 30, 2012
Nonqualified [Member]
Dec. 31, 2012
Nonqualified [Member]
Jun. 30, 2012
Nonqualified [Member]
Public Offering [Member]
Jun. 30, 2012
Nonqualified [Member]
Underwriter [Member]
Sep. 30, 2013
Nonqualified [Member]
Non-compensatory Rights [Member]
Sep. 30, 2013
Nonqualified [Member]
Compensatory Arrangements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Awards outstanding           4,622,505   4,622,505   598,507     4,597,505 25,000
Share-based compensation, operating expense   $ 332,250 $ 254,938 $ 1,227,597 $ 676,359 $ 0 $ 15,000 $ 22,000 $ 58,000          
Stock issued during period 14,400,000     12,200,000             12,200,000      
Warrants, number of shares 4,025,000 305,000   305,000   4,025,000   4,025,000       305,000    
Warrants, number of shares per warrant 0.35         0.35   0.35            
Warrants, exercise price 1.36 2.50   2.50               2.50    
Options granted               4,025,000 325,000          
Options granted, exercise price               $ 1.36            
Vested and exercisable value           $ 24,000 $ 56,000 $ 24,000 $ 56,000