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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Sales:    
Net sales $ 41,094 $ 42,292
Costs and expenses:    
Research and development 4,649 4,567
Sales, marketing and support 8,357 7,546
General and administrative 7,075 7,143
Total costs and expenses 45,802 45,899
Loss from operations (4,708) (3,607)
Interest income 208 233
Interest expense 1 18
Other income (expense), net 138 (789)
Loss before income tax expense (benefit) (4,363) (4,181)
Income tax expense (benefit) 329 (153)
Net loss $ (4,692) $ (4,028)
Net loss per common share    
Basic (in USD per share) $ (0.25) $ (0.22)
Diluted (in USD per share) $ (0.25) $ (0.22)
Weighted average number of common shares outstanding:    
Basic (in shares) 18,449,000 17,938,000
Diluted (in shares) 18,449,000 17,938,000
Product    
Sales:    
Net sales $ 14,370 $ 18,432
Costs and expenses:    
Costs of sales 10,729 11,220
Service    
Sales:    
Net sales 26,724 23,860
Costs and expenses:    
Costs of sales $ 14,992 $ 15,423