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STOCK-BASED COMPENSATION, Employee Stock Purchase Plan (Details) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Employee Stock Purchase Plan (ESPP) [Member]
Jun. 30, 2013
Employee Stock Purchase Plan (ESPP) [Member]
Jun. 25, 2009
Employee Stock Purchase Plan (ESPP) [Member]
Jun. 30, 2014
Employee Stock Purchase Plan (ESPP) [Member]
Selling, General and Adminstrative Expense [Member]
Jun. 30, 2013
Employee Stock Purchase Plan (ESPP) [Member]
Selling, General and Adminstrative Expense [Member]
Jun. 30, 2014
Employee Stock Purchase Plan (ESPP) [Member]
Selling, General and Adminstrative Expense [Member]
Jun. 30, 2013
Employee Stock Purchase Plan (ESPP) [Member]
Selling, General and Adminstrative Expense [Member]
Jun. 30, 2014
Employee Stock Purchase Plan (ESPP) [Member]
Research and Development Expense [Member]
Jun. 30, 2013
Employee Stock Purchase Plan (ESPP) [Member]
Research and Development Expense [Member]
Jun. 30, 2014
Employee Stock Purchase Plan (ESPP) [Member]
Research and Development Expense [Member]
Jun. 30, 2013
Employee Stock Purchase Plan (ESPP) [Member]
Research and Development Expense [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]                        
Reserved for issuance (in shares)       1,000,000                
Purchase period (in months)   3 months                    
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)   5,951 7,775                  
Proceeds from common stock issued 162,000 162,000 177,000                  
Charges to expense         $ 9,000 $ 8,000 $ 23,000 $ 15,000 $ 11,000 $ 19,000 $ 25,000 $ 42,000