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SHARE OPTIONS (Details) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
May 30, 2006
Sep. 30, 2010
Dec. 31, 2012
Dec. 31, 2012
Options
Dec. 31, 2011
Options
Dec. 31, 2010
Options
Dec. 31, 2011
Options
Minimum
Dec. 31, 2010
Options
Minimum
Dec. 31, 2011
Options
Maximum
Dec. 31, 2010
Options
Maximum
SHARE OPTIONS                    
Maximum aggregate number of shares to be issued 2,330,000                  
Annual percentage increase in authorized shares for awards other than incentive option shares 1.00%                  
Annual percentage increase in authorized shares on the first day of each of 2007, 2008 and 2009 prior to the year of amendment for awards other than incentive option shares   1.00%                
Annual percentage increase in authorized shares on the first day of each calendar year from the year of amendment for awards other than incentive option shares   2.50%                
Expiry term of share options     10 years              
Number of shares to be granted after expiration     0              
Share Options                    
Total unrecognized compensation expense related to share-based compensation awards       $ 5,349,957            
Weighted-average period of recognition of compensation expense       2 years 1 month 6 days            
Recognized compensation expense       3,433,077 3,382,786 3,641,260        
Income tax benefit for share-based compensation       0 0 0        
Assumptions used to estimate the fair value of stock options granted                    
Risk free rate (as a percent)       3.15%            
Risk free rate (as a percent)         2.76% 4.25%        
Risk free rate (as a percent)         3.46% 4.75%        
Volatility ratio (as a percent)       78.79%            
Volatility ratio (as a percent)         77.00% 80.00%        
Volatility ratio (as a percent)         79.00% 84.00%        
Annual exit rate (as a percent)       3.49%     3.07% 2.89% 4.37% 3.36%
Exercise multiple       4.40   5.00 4.40   4.70  
Number of Options                    
Options outstanding at the beginning of the period (in shares)       2,832,550            
Granted (in shares)       69,900            
Exercised (in shares)       (64,852)            
Forfeited (in shares)       (231,771)            
Options outstanding at the end of the period (in shares)       2,605,827 2,832,550          
Options vested or expected to vest at the end of the period (in shares)       2,471,787            
Options exercisable at the end of the period (in shares)       1,734,792            
Weighted Average Exercise Price                    
Options outstanding at the beginning of the period (in dollars per share)       $ 10.59            
Granted (in dollars per share)       $ 3.03            
Exercised (in dollars per share)       $ 2.45            
Forfeited (in dollars per share)       $ 14.33            
Options outstanding at the end of the period (in dollars per share)       $ 10.25 $ 10.59          
Options vested or expected to vest at the end of the period (in dollars per share)       $ 10.26            
Options exercisable at the end of the period (in dollars per share)       $ 10.43            
Weighted Average Remaining Contract Terms                    
Options outstanding at the end of the period       7 years            
Options vested or expected to vest at the end of the period       7 years            
Options exercisable at the end of the period       6 years            
Aggregate Intrinsic Value                    
Options outstanding at the end of the period       434,885            
Options vested or expected to vest at the end of the period       432,131            
Options exercisable at the end of the period       410,577            
Weighted average grant-date fair value of options granted (in dollars per share)       $ 2.22 $ 6.50 $ 9.62        
Total intrinsic value of options exercised       $ 38,958 $ 1,760,500 $ 1,786,605