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STOCK-BASED COMPENSATION - Employee Stock Purchase Plan - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 25, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from common stock issued	$ 586,000	$ 682,000	$ 1,241,000	$ 1,191,000
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
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)			9,339	8,042
Proceeds from common stock issued			$ 971,000	$ 847,000
Employee stock purchase plan ESPP purchase period			3 months
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	30,000	60,000	$ 70,000	85,000
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	54,000	113,000	125,000	164,000
Employee Stock Purchase Plan (ESPP) [Member] | Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Charges to expense	$ 34,000	$ 66,000	$ 75,000	$ 95,000

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Employee stock purchase plan ESPP compensation expense.

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

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

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

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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.

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Employee stock purchase plan ESPP shares in ESPP.

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Employee Stock Purchase Plan ESPP Purchase Period1

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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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