STOCK-BASED COMPENSATION, Employee Stock Purchase Plan - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 25, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from common stock issued			$ 412,000
Employee Stock Purchase Plan (ESPP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [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)			6,808	9,044
Proceeds from common stock issued			$ 318,000	$ 263,000
Employee Stock Purchase Plan (ESPP) [Member] | Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Charges to expense	$ 10,000	$ 9,000	31,000	26,000
Employee Stock Purchase Plan (ESPP) [Member] | Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Charges to expense	17,000	12,000	51,000	39,000
Employee Stock Purchase Plan (ESPP) [Member] | Cost of Material Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Charges to expense	$ 4,000	$ 2,000	$ 12,000	$ 6,000