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STOCK BASED COMPENSATION (Details 2) (USD $)
 6 Months Ended 191 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
May 23, 2012
Jun. 30, 2012
Minimum
Executive officers
Jun. 30, 2012
Minimum
Rank-in-file employees
Jun. 30, 2012
Maximum
Jun. 30, 2012
Maximum
Executive officers
Jun. 30, 2012
Maximum
Rank-in-file employees
Jun. 30, 2012
Stock options
security
Jun. 30, 2011
Stock options
Dec. 31, 2011
Stock options
Jun. 30, 2011
Stock options
Minimum
Jun. 30, 2012
Stock options
Minimum
Jun. 30, 2012
Stock options
Minimum
Executive officers
Jun. 30, 2012
Stock options
Minimum
Rank-in-file employees
Jun. 30, 2011
Stock options
Maximum
Jun. 30, 2012
Stock options
Maximum
Jun. 30, 2012
Stock options
Maximum
Executive officers
Jun. 30, 2012
Stock options
Maximum
Rank-in-file employees
Nov. 30, 2008
Restricted Stock
Jun. 30, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock Units
Nov. 30, 2008
Restricted Stock Units
Mar. 31, 2012
Restricted Stock Units
Jun. 30, 2012
Restricted Stock Units
Dec. 31, 2011
Restricted Stock Units
Dec. 31, 2008
Restricted Stock Units
Stock-based compensation                                                        
Number of shares reserved for issuance       10,000,000                                                
Number of shares reserved for issuance before amendment       5,200,000                                                
Expiration period             10 years                                          
Vesting period 4 years       3 years 3 years   5 years 4 years           3 years 3 years     5 years 4 years           3 years 3 years 4 years
Options                                                        
Options outstanding at the beginning of the period (in shares)                   3,515,741                                    
Granted (in shares)                   235,000 199,500                                  
Exercised (in shares)                   (77,062) 6,638                                  
Cancelled / forfeited (in shares)                   (112,315)                                    
Options outstanding at the end of the period (in shares)                   3,561,364   3,515,741                                
Unvested at the end of the period (in shares)                   620,385                                    
Vested and exercisable at the end of the period (in shares)                   2,940,979                                    
Weighted Average Exercise Price                                                        
Options outstanding at the beginning of the period (in dollars per share)                   $ 3.73                                    
Granted (in dollars per share)                   $ 0.47                                    
Exercised (in dollars per share)                   $ 0.44                                    
Cancelled / forfeited (in dollars per share)                   $ 1.37                                    
Options outstanding at the end of the period (in dollars per share)                   $ 3.66   $ 3.73                                
Unvested at the end of the period (in dollars per share)                   $ 1.31                                    
Vested and exercisable at the end of the period (in dollars per share)                   $ 4.16                                    
Weighted Average Remaining Contractual Term (years)                                                        
Options outstanding                   6 years 1 month 6 days   6 years 5 months 8 days                                
Unvested at the end of the period                   8 years 10 months 10 days                                    
Vested and exercisable at the end of the period                   5 years 6 months 4 days                                    
Aggregate Intrinsic Value                                                        
Options outstanding                   $ 23,000   $ 140,000                                
Vested and exercisable at the end of the period                   23,000                                    
Stock based compensation, additional disclosures                                                        
Percentage of the award vesting one year from the date of grant                   0.25                     0.25              
Period for vesting of one-fourth award                   1 year                     1 year              
Percentage of the award vesting each month after one year                   0.0208                     0.0208              
Percentage of the award vesting each month           0.0278     0.0208             0.0278       0.0208                
Assumptions for stock option grants to employees and directors                                                        
Expected term                   6 years     5 years       6 years                      
Risk free interest rate (as a percent)                   0.95%     1.47%       2.29%                      
Expected volatility (as a percent)                   98.00%     93.00%       99.00%                      
Resulting weighted average grant fair value (in dollars per share)                   $ 0.36 $ 1.15                                  
Stock based compensation, additional information                                                        
Forfeiture rate (as a percent)                           0.00%       30.00%                    
Number of Federal Reserve securities whose weighted average is used for calculation of weighted average risk-free interest rate                   2                                    
Cash proceeds $ 34,000 $ 3,000 $ 207,000             $ 34,000 $ 3,000                                  
Nonvested activity                                                        
Non-vested at the beginning of the period (in shares)                                           11,450     255,175 255,175    
Granted (in shares)                                         50,000   238,000 91,700 86,000 85,974    
Forfeited (in shares)                                                   (28,000)    
Vested (in shares)                                           (6,252)       (9,378)    
Non-vested at the end of the period (in shares)                                           5,198 255,175     303,771 255,175  
Weighted Average Grant Date Value Per Share                                                        
Non-vested at the beginning of the period (in dollars per share)                                           $ 0.44     $ 0.80 $ 0.80    
Granted (in dollars per share)                                                   $ 0.55    
Forfeited (in dollars per share)                                                   $ 0.83    
Vested (in dollars per share)                                           $ 0.44       $ 0.44    
Non-vested at the end of the period (in dollars per share)                                           $ 0.44 $ 0.80     $ 0.74 $ 0.80