XML 1115 R107.htm IDEA: XBRL DOCUMENT v2.4.0.6
STOCK BASED COMPENSATION (Details 2) (USD $)
 9 Months Ended 12 Months Ended 185 Months Ended 194 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Sep. 30, 2012
May 23, 2012
May 14, 2008
Dec. 31, 2010
Minimum
Executive officers
Dec. 31, 2010
Maximum
Executive officers
Sep. 30, 2012
Stock options
security
Sep. 30, 2011
Stock options
Dec. 31, 2011
Stock options
item
Dec. 31, 2010
Stock options
Dec. 31, 2009
Stock options
Sep. 30, 2012
Stock options
Executive officers
Sep. 30, 2012
Stock options
Rank-in-file employees
Sep. 30, 2011
Stock options
Minimum
Dec. 31, 2011
Stock options
Minimum
Dec. 31, 2010
Stock options
Minimum
Dec. 31, 2009
Stock options
Minimum
Sep. 30, 2012
Stock options
Minimum
Sep. 30, 2012
Stock options
Minimum
Executive officers
Sep. 30, 2012
Stock options
Minimum
Rank-in-file employees
Sep. 30, 2012
Stock options
Maximum
Sep. 30, 2011
Stock options
Maximum
Dec. 31, 2011
Stock options
Maximum
Dec. 31, 2010
Stock options
Maximum
Dec. 31, 2009
Stock options
Maximum
Sep. 30, 2012
Stock options
Maximum
Executive officers
Sep. 30, 2012
Stock options
Maximum
Rank-in-file employees
Nov. 30, 2008
Restricted Stock
Sep. 30, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2010
Restricted Stock
Dec. 31, 2011
Restricted Stock Units
Nov. 30, 2008
Restricted Stock Units
Mar. 31, 2012
Restricted Stock Units
Sep. 30, 2012
Restricted Stock Units
Dec. 31, 2011
Restricted Stock Units
Dec. 31, 2010
Restricted Stock Units
Dec. 31, 2008
Restricted Stock Units
Stock-based compensation                                                                                      
Number of shares reserved for issuance               10,000,000 5,200,000                                                                    
Number of shares reserved for issuance before amendment               5,200,000 3,000,000                                                                    
Expiration period                                                   10 years                                  
Vesting period     4 years             3 years 5 years 4 years                       3 years 3 years           5 years 4 years           4 years   3 years 3 years   4 years
Options                                                                                      
Options outstanding at the beginning of the period (in shares)                       502,249 498,562 498,562 478,554                                                        
Granted (in shares)                       33,571 28,500 28,500 86,758                                                        
Exercised (in shares)     (948) (24,902)               (15,438) (948) (948) (24,901) (2,454)                                                      
Cancelled / forfeited (in shares)                       (39,970)   (23,865) (41,849)                                                        
Options outstanding at the end of the period (in shares)                       480,415   502,249 498,562 478,554                                                      
Unvested at the end of the period (in shares)                       77,607   90,237                                                          
Vested and exercisable at the end of the period (in shares)                       402,808   412,012                                                          
Weighted Average Exercise Price                                                                                      
Options outstanding at the beginning of the period (in dollars per share)                       $ 26.11 $ 27.72 $ 27.72 $ 29.47                                                        
Granted (in dollars per share)                       $ 3.29   $ 10.64 $ 12.74                                                        
Exercised (in dollars per share)                       $ 3.06   $ 2.87 $ 3.01                                                        
Cancelled / forfeited (in dollars per share)                       $ 20.03   $ 40.53 $ 31.78                                                        
Options outstanding at the end of the period (in dollars per share)                       $ 25.76   $ 26.11 $ 27.72 $ 29.47                                                      
Unvested at the end of the period (in dollars per share)                       $ 9.00   $ 12.11                                                          
Vested and exercisable at the end of the period (in dollars per share)                       $ 28.99   $ 29.19                                                          
Weighted Average Remaining Contractual Term (years)                                                                                      
Options outstanding                       5 years 10 months 2 days   6 years 5 months 8 days 7 years 2 months 19 days 7 years 9 months 4 days                                                      
Unvested at the end of the period                       8 years 8 months 1 day   8 years 9 months                                                          
Vested and exercisable at the end of the period                       5 years 3 months 18 days   5 years 11 months 5 days                                                          
Aggregate Intrinsic Value                                                                                      
Options outstanding                       $ 212,000   $ 140,000 $ 938,000 $ 698,000                                                      
Unvested at the end of the period                       36,000   3,000                                                          
Vested and exercisable at the end of the period                       176,000   136,000                                                          
Stock based compensation, additional disclosures                                                                                      
Percentage of the award vesting one year from the date of grant     0.25                 0.25                                         0.25                    
Period for vesting of one-fourth award     1 year                 1 year                                         1 year                    
Percentage of the award vesting each month after one year     0.0208                 0.0208                                         0.0208                    
Percentage of the award vesting each month       0.0208                         0.0278 0.0208                                                  
Assumptions for stock option grants to employees and directors                                                                                      
Expected term                       6 years             5 years 5 years 5 years 9 months         6 years 6 years 6 years 5 years                          
Risk free interest rate (as a percent)                       0.95%             1.47% 1.47% 1.64% 0.325%         2.29% 2.29% 2.96% 0.84%                          
Expected volatility (as a percent)                       98.00%             93.00% 93.00% 90.00% 65.00%         99.00% 99.00% 102.00% 169.00%                          
Resulting weighted average grant fair value (in dollars per share)                       $ 2.52 $ 8.05 $ 8.05 $ 9.80 $ 2.73                                                      
Stock based compensation, additional information                                                                                      
Forfeiture rate (as a percent)                                       0.00%     0.00%     30.00%   50.00%                              
Number of Federal Reserve securities whose weighted average is used for calculation of weighted average risk-free interest rate                       2   2                                                          
Cash proceeds $ 48,000 $ 3,000 $ 3,000   $ 7,000 $ 173,000 $ 221,000         $ 48,000 $ 3,000 $ 3,000 $ 100,000 $ 7,000                                                      
Nonvested activity                                                                                      
Non-vested at the beginning of the period (in shares)                                                                   1,632 3,418 5,204     36,463 36,463 5,142 7,812  
Granted (in shares)                                                                 7,142       34,000 13,100 12,281 12,281 34,000    
Forfeited (in shares)                                                                               (6,904)      
Vested (in shares)                                                                   (1,341) (1,786) (1,786)       (2,010) (2,679) (2,670)  
Non-vested at the end of the period (in shares)                                                                   291 1,632 3,418 36,463     39,830 36,463 5,142  
Weighted Average Grant Date Value Per Share                                                                                      
Non-vested at the beginning of the period (in dollars per share)                                                                   $ 3.08 $ 3.08 $ 3.08     $ 5.60 $ 5.60 $ 3.08 $ 3.08  
Granted (in dollars per share)                                                                               $ 3.85 $ 5.81    
Forfeited (in dollars per share)                                                                               $ 4.99      
Vested (in dollars per share)                                                                   $ 3.08 $ 3.08 $ 3.08       $ 3.08 $ 3.08 $ 3.08  
Non-vested at the end of the period (in dollars per share)                                                                   $ 3.08 $ 3.08 $ 3.08 $ 5.60     $ 5.32 $ 5.60 $ 3.08