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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Sales:        
Net sales $ 33,549 $ 35,169 $ 101,409 $ 102,873
Costs and expenses:        
Research and development 2,398 2,745 7,379 8,380
Sales, marketing and support 4,854 5,710 15,708 18,355
General and administrative 4,367 5,559 13,139 19,532
Goodwill impairment charge 5,333 0 5,333 0
Long-lived assets impairment charge 657 0 657 0
Total costs and expenses 38,576 36,140 106,660 109,135
Loss from operations (5,027) (971) (5,251) (6,262)
Interest income 997 389 2,660 798
Interest expense 0 1 0 3
Other (expense) income, net (121) 569 (583) 1,561
Loss from continuing operations before income tax expense (4,151) (14) (3,174) (3,906)
Income tax expense from continuing operations 95 81 159 645
Net loss from continuing operations (4,246) (95) (3,333) (4,551)
Net income from discontinued operations, net of tax 0 29,741 0 28,061
Net (loss) income $ (4,246) $ 29,646 $ (3,333) $ 23,510
Net loss from continuing operations per common share        
Basic (in shares) $ (0.22) $ (0.01) $ (0.17) $ (0.25)
Diluted (in shares) (0.22) (0.01) (0.17) (0.25)
Net income from discontinued operations per common share        
Basic (in shares) 0.00 1.59 0.00 1.51
Diluted (in shares) 0.00 1.59 0.00 1.51
Net (loss) income per common share        
Basic (in USD per share) (0.22) 1.58 (0.17) 1.27
Diluted (in USD per share) $ (0.22) $ 1.58 $ (0.17) $ 1.27
Weighted average number of common shares outstanding:        
Basic (in shares) 19,231 18,706 19,090 18,574
Diluted (in shares) 19,231 18,706 19,090 18,574
Product        
Sales:        
Net sales $ 4,152 $ 6,625 $ 14,526 $ 19,808
Costs and expenses:        
Costs of sales 4,729 6,747 16,596 17,363
Service        
Sales:        
Net sales 29,397 28,544 86,883 83,065
Costs and expenses:        
Costs of sales $ 16,238 $ 15,379 $ 47,848 $ 45,505