STOCK-BASED COMPENSATION, Employee Stock Purchase Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 25, 2009
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Proceeds from common stock issued	$ 328,000	$ 343,000	$ 321,000
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)	12,373	14,366	11,667
Proceeds from common stock issued	328,000	343,000	321,000
Employee Stock Purchase Plan (ESPP) [Member] | Selling, General and Administrative Expenses [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Charges to expense	44,000	36,000	26,000
Employee Stock Purchase Plan (ESPP) [Member] | Research and Development Expense [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Charges to expense	$ 52,000	$ 71,000	$ 78,000