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STOCK-BASED COMPENSATION, Employee Stock Purchase Plan - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 25, 2009
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Proceeds from common stock issued     $ 264,000    
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)     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)     4,331 5,819  
Proceeds from common stock issued     $ 201,000 $ 171,000  
Employee Stock Purchase Plan (ESPP) [Member] | Selling, General and Administrative Expenses [Member]          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Charges to expense $ 10,000 $ 10,000 20,000 21,000  
Employee Stock Purchase Plan (ESPP) [Member] | Research and Development Expense [Member]          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Charges to expense 18,000 13,000 35,000 26,000  
Employee Stock Purchase Plan (ESPP) [Member] | Cost of Material Sales [Member]          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Charges to expense $ 4,000 $ 0 $ 8,000 $ 0