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Share-based compensation expenses (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation     $ 145,459 $ 612,057
Stock Options Related to Employees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares granted     100,000  
Exercise price of options granted     $ 1.15  
Options forfeited     65,000  
Weighted-average fair value of options granted    $ 0.52 $ 0.74 $ 1.47
Unrecognized share-based compensation expense 500,000   500,000  
Weighted-average recognition period     2 years 6 months 29 days  
Share-based compensation 52,030 335,231 144,661 611,650
Non Employee Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation $ 266 $ (354) $ 798 $ 407
Unvested Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested options held by Nonemployees 12,000   12,000  
2008 Omnibus Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock available for issuance 1,303,000   1,303,000  
Incentive Plan Term     10 years  
Common stock reserved for issuance 2,000,000   2,000,000  
2008 Omnibus Incentive Plan [Member] | Stock Options and SARs [Member] | Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for plan     4 years  
2008 Omnibus Incentive Plan [Member] | Stock Options and SARs [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for plan     5 years