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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sales:    
Net sales $ 158,733 $ 157,893
Costs and expenses:    
Research and development 15,799 15,926
Sales, marketing and support 29,811 33,434
General and administrative 24,445 25,486
Goodwill impairment charge 8,732 0
Intangible asset impairment charge 1,758 0
Total costs and expenses 181,670 178,989
Loss from operations (22,937) (21,096)
Interest income 996 2,003
Interest expense 18 1,020
Other income, net 193 101
Loss from continuing operations before income tax expense (benefit) (21,766) (20,012)
Income tax expense (benefit) from continuing operations 174 (4,003)
Net loss from continuing operations (21,940) (16,009)
Income from discontinued operations, net of tax 0 49,264
Net (loss) income $ (21,940) $ 33,255
Net loss from continuing operations per common share    
Basic and diluted (in USD per share) $ (1.24) $ (0.92)
Net income from discontinued operations per common share    
Basic and diluted (in USD per share) 0.00 2.82
Net (loss) income per common share    
Basic and diluted (in USD per share) $ (1.24) $ 1.90
Number of shares used in per share calculation:    
Basic and diluted (in shares) 17,669 17,459
Product    
Sales:    
Net sales $ 64,619 $ 61,925
Costs and expenses:    
Cost of product and service sales 41,608 42,887
Service    
Sales:    
Net sales 94,114 95,968
Costs and expenses:    
Cost of product and service sales $ 59,517 $ 61,256