Quarterly report pursuant to Section 13 or 15(d)

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

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Stock options and warrants (Stock incentive plan options) (Narrative) (Details) (USD $)
 9 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Maximum [Member]
Sep. 30, 2014
Stock Incentive Plan [Member]
Sep. 30, 2013
Stock Incentive Plan [Member]
Sep. 30, 2014
Stock Incentive Plan [Member]
Independent Directors [Member]
Sep. 30, 2014
Stock Incentive Plan [Member]
Officers Employees and Consultant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares reserved under the Plan   3,673,126 1,912,205            
Incentive stock options exercised to purchase common shares 39,079         39,079      
Total proceeds from stock options exercised to purchase common shares $ 82,000                
Intrinsic value of stock options exercised to purchase common shares 14,000                
Options granted           727,100   221,000 506,100
Weighted average exercise price of options granted           $ 2.29   $ 2.27 $ 2.29
Weighted-average fair value of options granted           $ 1.89      
Expiration period       3 years 5 years     10 years 10 years
Options vested           486,727     431,100
Vesting period               1 year 2 years
Vesting rate               25.00% 50.00%
Options vested annually in arrears from grant date                 75,000
Vesting period to vest annually in arrears from grant date                 3 years
Options forfeited           41,561 13,394    
Options expired           36,511 6,086    
Options forfeited, unvested           5,050 7,308    
Options expired, exercise price           $ 33.86 $ 57.98    
Options forfeited, unvested, exercise price           $ 2.15 $ 2.46    
Fair value of options vested           1,047,000 1,055,000    
Expected to vest           370,000      
Unrecognized compensation cost           $ 487,000      
Unrecognized compensation cost, period for recognition           3 years