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REVENUE - Additional disclosures (Details) - USD ($)	3 Months Ended		6 Months Ended
REVENUE - Additional disclosures (Details) - USD ($)	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
REVENUE
Revenue	$ 7,459,000	$ 7,503,000	$ 14,218,000	$ 15,344,000
Deferred revenue	3,700,000		3,700,000		$ 3,600,000
Contract assets	0		0		0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
REVENUE
Revenue expected to be earned					$ 3,300,000
Revenue expected to be earned period					12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01
REVENUE
Revenue expected to be earned	$ 3,400,000		$ 3,400,000
Revenue expected to be earned period	12 months		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
REVENUE
Revenue expected to be earned					$ 200,000
Revenue expected to be earned period					12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01
REVENUE
Revenue expected to be earned	$ 300,000		$ 300,000
Revenue expected to be earned period	48 months		48 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
REVENUE
Revenue expected to be earned					$ 100,000
Revenue expected to be earned period					36 months
International
REVENUE
Revenue	$ 927,000	975,000	$ 1,887,000	2,393,000
China
REVENUE
Revenue	$ 20,000	$ 300,000	$ 20,000	$ 600,000