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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sales:        
Net sales $ 41,837 $ 43,363 $ 82,931 $ 85,655
Costs and expenses:        
Research and development 3,759 4,505 8,408 9,072
Sales, marketing and support 6,975 7,937 15,332 15,483
General and administrative 6,898 8,705 13,973 15,848
Total costs and expenses 44,169 49,165 89,971 95,064
Loss from operations (2,332) (5,802) (7,040) (9,409)
Interest income 201 222 409 455
Interest expense 1 14 2 32
Other income (expense), net 923 (1) 1,061 (790)
Loss before income tax expense (benefit) (1,209) (5,595) (5,572) (9,776)
Income tax expense (benefit) 235 78 564 (75)
Net loss $ (1,444) $ (5,673) $ (6,136) $ (9,701)
Net loss per common share        
Basic (in USD per share) $ (0.08) $ (0.31) $ (0.33) $ (0.54)
Diluted (in USD per share) $ (0.08) $ (0.31) $ (0.33) $ (0.54)
Weighted average number of common shares outstanding:        
Basic (in shares) 18,564,000 18,174,000 18,507,000 18,057,000
Diluted (in shares) 18,564,000 18,174,000 18,507,000 18,057,000
Product        
Sales:        
Net sales $ 13,579 $ 17,269 $ 27,949 $ 35,701
Costs and expenses:        
Costs of sales 11,115 11,894 21,844 23,114
Service        
Sales:        
Net sales 28,258 26,094 54,982 49,954
Costs and expenses:        
Costs of sales $ 15,422 $ 16,124 $ 30,414 $ 31,547