Quarterly report pursuant to Section 13 or 15(d)

Stock options and warrants (Stock incentive plan options) (Narrative) (Details)

v3.3.0.814
Stock options and warrants (Stock incentive plan options) (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares reserved under the Plan 5,673,127 3,673,127
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period 3 years  
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period 5 years  
Stock Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted 1,094,500  
Options granted, exercise price $ 1.89  
Options forfeited 217,427 41,561
Options expired 37,154 36,511
Options forfeited, unvested 180,273 5,050
Options expired, exercise price $ 11.36 $ 33.86
Options forfeited, unvested, exercise price $ 2.05 $ 2.15
Fair value of options vested $ 461,000 $ 1,047,000
Expected to vest 797,000  
Unrecognized compensation cost $ 394,000  
Unrecognized compensation cost, period for recognition 1 year  
Stock Incentive Plan [Member] | Independent Directors [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted 344,000  
Options granted, exercise price $ 1.89  
Expiration period 10 years  
Vesting period 1 year  
Vesting rate 25.00%  
Stock Incentive Plan [Member] | Officers and Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted 750,500  
Options granted, exercise price $ 1.89  
Expiration period 10 years  
Vesting period 2 years  
Vesting rate 50.00%