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STOCK-BASED COMPENSATION - Employee Stock Purchase Plan - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 25, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from common stock issued	$ 317,000	$ 311,000	$ 594,000	$ 564,000
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)			4,360	5,532
Proceeds from common stock issued			$ 445,000	$ 434,000
Employee Stock Purchase Plan (ESPP) [Member] | Selling, General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Charges to expense	25,000	24,000	47,000	41,000
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	33,000	33,000	64,000	56,000
Employee Stock Purchase Plan (ESPP) [Member] | Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Charges to expense	$ 18,000	$ 19,000	$ 38,000	$ 33,000

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- Definition

Employee stock purchase plan ESPP compensation expense.

+ References

No definition available.

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The maximum percentage of employees' base compensation that can be allocated under the plan.

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- Definition

The maximum number of shares that may be purchased on a given purchase date, under the plan.

+ References

No definition available.

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- Definition

The maximum value of shares that may be purchased by a single employee during a given calendar year, under the plan.

+ References

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- Definition

The percentage of the lesser of the price per share of common stock on the first day of the purchase period, or the last day of the purchase period, at which eligible employees may purchase shares under the plan.

+ References

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The duration (in consecutive months) of purchase periods as defined by the the plan.

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Employee stock purchase plan ESPP shares in ESPP.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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