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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Sales:        
Net sales $ 28,971 $ 33,195 $ 86,911 $ 100,924
Costs and expenses:        
Research and development 1,407 2,398 6,771 7,379
Sales, marketing and support 4,932 4,841 15,650 15,673
General and administrative 3,789 4,367 13,214 13,139
Goodwill impairment charge 0 5,333 0 5,333
Long-lived assets impairment charge   657 1,137 657
Total costs and expenses 30,962 38,345 95,589 106,071
Loss from operations (1,991) (5,150) (8,678) (5,147)
Interest income 629 997 2,416 2,660
Interest expense 2 0 2 0
Other income (expense), net 216 (121) (348) (583)
Loss before income tax expense (1,148) (4,274) (6,612) (3,070)
Income tax expense 51 95 126 159
Net loss $ (1,199) $ (4,369) $ (6,738) $ (3,229)
Net loss per common share        
Basic (in dollars per share) $ (0.06) $ (0.23) $ (0.35) $ (0.17)
Diluted (in dollars per share) $ (0.06) $ (0.23) $ (0.35) $ (0.17)
Weighted average number of common shares outstanding:        
Basic (in shares) 19,433 19,231 19,367 19,090
Diluted (in shares) 19,433 19,231 19,367 19,090
Service        
Sales:        
Net sales $ 24,410 $ 29,397 $ 74,122 $ 86,883
Costs and expenses:        
Cost of product and service sales 14,983 16,238 44,496 47,848
Product        
Sales:        
Net sales 4,561 3,798 12,789 14,041
Costs and expenses:        
Cost of product and service sales $ 4,714 $ 4,511 $ 14,321 $ 16,042