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Stock options and warrants (Stock incentive plan options) (Narrative) (Details) (USD $)
 3 Months Ended 4 Months Ended 3 Months Ended 4 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Minimum [Member]
Mar. 31, 2013
Maximum [Member]
Mar. 31, 2013
Stock Incentive Plan [Member]
Mar. 31, 2012
Stock Incentive Plan [Member]
Mar. 31, 2013
Stock Incentive Plan [Member]
Independent Directors [Member]
Apr. 30, 2013
Stock Incentive Plan [Member]
Independent Directors [Member]
Mar. 31, 2013
Stock Incentive Plan [Member]
Officers [Member]
Mar. 31, 2013
Stock Incentive Plan [Member]
Employees [Member]
Mar. 31, 2012
Stock Incentive Plan [Member]
Employees [Member]
Apr. 30, 2013
Stock Incentive Plan [Member]
New Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based compensation, operating expense $ 484,222 $ 221,996     $ 470,000 $ 193,000            
Expiration period     3 years 5 years     10 years   10 years 10 years    
Options granted         474,270              
Options granted, exercise price         $ 2.09   $ 168,000 $ 41,333 $ 292,000 $ 14,270   $ 10,000
Weighted-average fair value of options granted             $ 2.19 $ 1.75 $ 2.04 $ 2.04   $ 1.99
Vesting period             1 year 3 years 24 months 24 months   3 years
Number of shares vesting in arrears               24,000        
Options forfeited         (6,644)           119,721  
Options forfeited, vested                     4,667  
Options forfeited, unvested                     115,054  
Options forfeited, exercise price         $ 2.43           $ 4.60  
Common stock options exercised, shares                         
Options exercised, intrinsic value         532,000 1,142,000            
Expected to vest         777,000              
Unrecognized compensation cost         $ 1,150,000              
Unrecognized compensation cost, period for recognition         1 year