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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sales:        
Net sales $ 41,112 $ 39,311 $ 114,606 $ 115,417
Costs and expenses:        
Research and development 3,548 4,327 11,701 11,993
Sales, marketing and support 6,931 7,717 22,426 24,700
General and administrative 5,839 6,273 18,006 18,958
Total costs and expenses 41,615 44,169 126,193 133,188
Loss from operations (503) (4,858) (11,587) (17,771)
Interest income 229 451 759 1,626
Interest expense 2 73 9 1,016
Other (expense) income, net (370) 680 971 922
Loss from continuing operations before income tax (benefit) expense (646) (3,800) (9,866) (16,239)
Income tax (benefit) expense (109) (492) 437 (3,140)
Net loss from continuing operations (537) (3,308) (10,303) (13,099)
(Loss) income from discontinued operations, net of tax 0 (1,036) 0 49,837
Net (loss) income $ (537) $ (4,344) $ (10,303) $ 36,738
Net loss from continuing operations per common share        
Basic and diluted (in USD per share) $ (0.03) [1] $ (0.19) $ (0.58) $ (0.75)
Net (loss) income from discontinued operations per common share        
Basic and diluted (in USD per share) 0.00 (0.06) 0.00 2.86
Net (loss) income per common share        
Basic and diluted (in USD per share) $ (0.03) $ (0.25) $ (0.58) $ 2.11
Weighted average number of common shares outstanding:        
Basic and diluted (in shares) 17,723,000 17,521,000 17,634,000 17,429,000
Product        
Sales:        
Net sales $ 16,650 $ 14,808 $ 43,693 $ 43,212
Costs and expenses:        
Costs of sales 10,422 10,823 29,612 31,756
Service        
Sales:        
Net sales 24,462 24,503 70,913 72,205
Costs and expenses:        
Costs of sales $ 14,875 $ 15,029 $ 44,448 $ 45,781
[1] Tax impact was nominal for all periods.