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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sales:    
Net sales $ 171,767 $ 158,733
Costs and expenses:    
Research and development 17,766 15,799
Sales, marketing and support 31,181 29,811
General and administrative 28,794 24,445
Goodwill impairment charge 0 1,758
Intangible asset impairment charge 0 8,732
Total costs and expenses 189,713 181,670
Loss from operations (17,946) (22,937)
Interest income 886 996
Interest expense 56 18
Other income, net 7,245 193
Loss before income tax (benefit) expense (9,871) (21,766)
Income tax (benefit) expense (108) 174
Net loss $ (9,763) $ (21,940)
Net loss per common share    
Basic (in dollars per share) $ (0.54) $ (1.24)
Diluted (in dollars per share) $ (0.54) $ (1.24)
Weighted average number of shares outstanding:    
Weighted average number of shares outstanding - basic (in shares) 18,217 17,669
Weighted average number of shares outstanding - diluted (in shares) 18,217 17,669
Product    
Sales:    
Net sales $ 66,870 $ 64,619
Costs and expenses:    
Cost of product and service sales 46,810 41,608
Service    
Sales:    
Net sales 104,897 94,114
Costs and expenses:    
Cost of product and service sales $ 65,162 $ 59,517