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STOCK-BASED COMPENSATION - Employee Stock Purchase Plan (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]    
Proceeds from common stock issued $ 93,000  
General and Administrative Expense [Member]
    
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]    
Charges to expense 7,000 5,000
Research and Development Expense [Member]
    
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]    
Charges to expense 23,000 20,000
Employee Stock Purchase Plan (ESPP) [Member]
    
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]    
Reserved for issuance (in shares) 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 25,000  
Common stock issued (in shares) 4,258 2,298
Proceeds from common stock issued $ 93,000 $ 71,000