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STOCK-BASED COMPENSATION - Equity Compensation Plan (Details) (USD $)
 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Board of Directors [Member]
Mar. 31, 2013
Employees and Non Employee Members of Scientific Advisory Board [Member]
Mar. 31, 2012
General and Administrative Expense [Member]
Board of Directors [Member]
Mar. 31, 2013
Research and Development Expense [Member]
Employees and Non Employee Members of Scientific Advisory Board [Member]
Mar. 31, 2012
Research and Development Expense [Member]
Employees and Non Employee Members of Scientific Advisory Board [Member]
Mar. 31, 2013
Restricted Stock Awards and Restricted Stock Units [Member]
Mar. 31, 2013
Restricted Stock Awards and Restricted Stock Units [Member]
General and Administrative Expense [Member]
Mar. 31, 2012
Restricted Stock Awards and Restricted Stock Units [Member]
General and Administrative Expense [Member]
Mar. 31, 2013
Restricted Stock Awards and Restricted Stock Units [Member]
Research and Development Expense [Member]
Mar. 31, 2012
Restricted Stock Awards and Restricted Stock Units [Member]
Research and Development Expense [Member]
Mar. 31, 2013
Restricted Stock Awards and Restricted Stock Units [Member]
Minimum [Member]
Mar. 31, 2013
Restricted Stock Awards and Restricted Stock Units [Member]
Maximum [Member]
Mar. 07, 2013
Performance Shares [Member]
Mar. 31, 2013
Performance Shares [Member]
Mar. 07, 2013
Performance Shares [Member]
Performance Vesting [Member]
Mar. 31, 2013
Performance Shares [Member]
Performance Vesting [Member]
Mar. 07, 2013
Performance Shares [Member]
Market-based Vesting [Member]
Mar. 31, 2013
Performance Shares [Member]
Market-based Vesting [Member]
Mar. 31, 2013
Performance Shares [Member]
General and Administrative Expense [Member]
Mar. 31, 2013
Performance Shares [Member]
Research and Development Expense [Member]
Mar. 31, 2013
Common Stock [Member]
Research and Development Expense [Member]
Mar. 31, 2012
Common Stock [Member]
Research and Development Expense [Member]
Mar. 31, 2013
Stock Appreciation Rights (SARs) [Member]
Mar. 31, 2012
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2012
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Mar. 31, 2012
Stock Appreciation Rights (SARs) [Member]
General and Administrative Expense [Member]
Mar. 31, 2012
Stock Appreciation Rights (SARs) [Member]
Research and Development Expense [Member]
Mar. 31, 2013
Equity Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                            
Expiration term (in years)                                                           10 years
Number of shares authorized (in shares)                                                           8,000,000
Granted (in shares)             111,821                                              
Fair value of options granted             $ 3,700,000                                              
Vesting period from date of grant (in years)                       2 years 3 years                                  
Compensation expense               767,000 573,000 327,000 171,000                 38,000 11,000 0 31,000         1,000 3,000  
Shares of common stock withheld to satisfy tax obligations             88,063                                              
Fair value of shares of common stock withheld to satisfy tax obligations 2,800,000                                                          
Performance period over which performance units are measured                               2 years   2 years                        
Maximum number of performance units that may vest as a multiple of target level shares                           2                                
Number of performance units granted during period                             35,776   17,888   17,888         0   0 24,000      
Total fair value of performance units granted during the period                             1,400,000                              
Base price of each SAR award (usd per share)                                                     $ 34.78      
Cash payments as a result of settlement of SARs                                                 49,000          
Number of shares of common stock issued during the period   5,000 7,370                                                      
Fair value of shares issued during the period   138,000   160,000                                                    
Vesting period of restricted stock     3 years                                                      
Compensation expense         $ 86,000 $ 53,000