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STOCK-BASED COMPENSATION - Employee Stock Purchase Plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Proceeds from common stock issued     $ 234  
General and Administrative Expense [Member]
        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Charges to expense 8 5 15 10
Research and Development Expense [Member]
        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Charges to expense 19 15 42 35
Employee Stock Purchase Plan (ESPP) [Member]
        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Reserved for issuance (in shares) 1,000,000   1,000,000  
Purchase period (in months)     three  
Percentage of market value (in hundredths)     85.00%  
Maximum allocation of base compensation (in hundredths)     10.00%  
Maximum shares per purchase date (in shares)     12,500  
Maximum value per calendar year, per employee     25  
Common stock issued (in shares)     7,775 4,461
Proceeds from common stock issued     $ 177 $ 137