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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sales:        
Net sales $ 39,235 $ 38,632 $ 75,270 $ 74,037
Costs and expenses:        
Research and development 3,798 3,565 7,666 7,499
Sales, marketing and support 8,853 7,609 16,987 15,186
General and administrative 5,730 5,713 12,685 12,146
Total costs and expenses 46,068 41,212 88,251 80,449
Loss from operations (6,833) (2,580) (12,981) (6,412)
Interest income 1,000 147 1,175 293
Interest expense 558 427 943 836
Other income, net 338 543 242 237
Loss from continuing operations before income tax (benefit) expense (6,053) (2,317) (12,507) (6,718)
Income tax (benefit) expense from continuing operations (2,599) 85 (2,631) 130
Net loss from continuing operations (3,454) (2,402) (9,876) (6,848)
Income from discontinued operations, net of tax 50,630 1,059 50,873 1,612
Net income (loss) $ 47,176 $ (1,343) $ 40,997 $ (5,236)
Net loss from continuing operations per common share        
Basic and diluted (in USD per share) $ (0.20) $ (0.14) $ (0.57) $ (0.40)
Net income from discontinuing operations per common share        
Basic and diluted (in USD per share) 2.90 0.06 2.93 0.10
Net income (loss) per common share        
Basic and diluted (in USD per share) $ 2.70 $ (0.08) $ 2.36 $ (0.31)
Weighted average number of common shares outstanding:        
Basic and diluted (in shares) 17,463      
Product        
Sales:        
Net sales $ 14,694 $ 16,162 $ 27,568 $ 30,154
Costs and expenses:        
Costs of product sales 12,308 10,094 20,161 19,017
Service        
Sales:        
Net sales 24,541 22,470 47,702 43,883
Costs and expenses:        
Costs of product sales $ 15,379 $ 14,231 $ 30,752 $ 26,601