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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sales:        
Net sales $ 36,926 $ 39,730 $ 73,494 $ 76,106
Costs and expenses:        
Research and development 3,866 3,798 8,153 7,666
Sales, marketing and support 6,795 8,853 15,495 16,983
General and administrative 5,769 5,730 12,167 12,685
Total costs and expenses 40,362 46,409 84,578 89,019
Loss from operations (3,436) (6,679) (11,084) (12,913)
Interest income 217 1,000 530 1,175
Interest expense 3 558 7 943
Other (expense) income, net (161) 339 1,341 242
Loss from continuing operations before income tax expense (benefit) (3,383) (5,898) (9,220) (12,439)
Income tax expense (benefit) 169 (2,604) 546 (2,648)
Net loss from continuing operations (3,552) (3,294) (9,766) (9,791)
Income from discontinued operations, net of tax 0 50,630 0 50,873
Net (loss) income $ (3,552) $ 47,336 $ (9,766) $ 41,082
Net loss from continuing operations per common share        
Basic and diluted (in USD per share) [1] $ (0.20) $ (0.19) $ (0.56) $ (0.56)
Net income from discontinued operations per common share        
Basic and diluted (in USD per share) [1] 0.00 2.90 0.00 2.93
Net (loss) income per common share        
Basic and diluted (in USD per share) [1] $ (0.20) $ 2.71 $ (0.56) $ 2.36
Weighted average number of common shares outstanding:        
Basic and diluted (in shares) 17,648,000 17,463,000 17,588,000 17,383,000
Product        
Sales:        
Net sales $ 13,949 $ 15,189 $ 27,043 $ 28,404
Costs and expenses:        
Costs of sales 9,554 12,649 19,190 20,933
Service        
Sales:        
Net sales 22,977 24,541 46,451 47,702
Costs and expenses:        
Costs of sales $ 14,378 $ 15,379 $ 29,573 $ 30,752
[1] Earnings per share components for 2019 do not sum due to rounding.