Annual report [Section 13 and 15(d), not S-K Item 405]

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax      
Valuation allowance $ 74,451,000 $ 78,659,000 $ 65,600,000
Deferred tax asset, increase to additional paid in capital 6,300,000    
Decrease of deferred tax assets related to capitalized research expenses 16,300,000    
Operating loss carryforwards, subject to annual limitations 1,100,000    
Deferred tax liabilities for undistributed foreign earnings 300,000 200,000 100,000
Penalties or interest liabilities accrued 0 0 0
Pretax income 9,000,000.0 9,600,000 6,500,000
Foreign subsidiaries' undistributed earnings 17,300,000    
Deferred Tax Asset, Increase To Additional Paid In Capital      
Income Tax      
Valuation allowance, deferred tax asset, increase (decrease) (6,300,000)    
Deferred Tax Assets, Foriegn      
Income Tax      
Valuation allowance, deferred tax asset, increase (decrease) (1,400,000)    
Luminescent Systems Canada Inc.      
Income Tax      
Foreign subsidiaries' undistributed earnings 7,000,000.0 $ 3,000,000.0 $ 1,900,000
Domestic Tax Jurisdiction      
Income Tax      
Operating loss carryforwards 41,800,000    
Operating loss carryforwards, subject to annual limitation and expiration 700,000    
Operating loss carryforwards, subject to annual limitation and not subject to expiration 400,000    
Operating loss carryforward, not subject to annual limitation and expiration 40,700,000    
Tax credit carryforwards 3,400,000    
State      
Income Tax      
Operating loss carryforwards 146,500,000    
Operating loss carryforwards, subject to expiration 127,300,000    
Operating loss carryforwards,, not subject to expiration 19,200,000    
Tax credit carryforwards 1,400,000    
Foreign Tax Jurisdiction      
Income Tax      
Tax credit carryforwards $ 200,000