STOCK-BASED COMPENSATION, Employee Stock Purchase Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 25, 2009
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Proceeds from common stock issued	$ 447,000	$ 328,000	$ 343,000
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)	12,246	12,373	14,366
Proceeds from common stock issued	$ 354,000	$ 328,000	$ 343,000
Employee Stock Purchase Plan (ESPP) [Member] | Selling, General and Administrative Expenses [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Charges to expense	43,000	44,000	36,000
Employee Stock Purchase Plan (ESPP) [Member] | Research and Development Expense [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Charges to expense	$ 50,000	$ 52,000	$ 71,000