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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sales:        
Net sales $ 43,363 $ 36,926 $ 85,655 $ 73,494
Costs and expenses:        
Research and development 4,505 3,866 9,072 8,153
Sales, marketing and support 7,937 6,795 15,483 15,495
General and administrative 8,705 5,769 15,848 12,167
Total costs and expenses 49,165 40,362 95,064 84,578
Loss from operations (5,802) (3,436) (9,409) (11,084)
Interest income 222 217 455 530
Interest expense 14 3 32 7
Other (expense) income, net (1) (161) (790) 1,341
Loss before income tax expense (benefit) (5,595) (3,383) (9,776) (9,220)
Income tax expense (benefit) 78 169 (75) 546
Net loss $ (5,673) $ (3,552) $ (9,701) $ (9,766)
Net loss per common share        
Basic (in USD per share) $ (0.31) $ (0.20) $ (0.54) $ (0.56)
Diluted (in USD per share) $ (0.31) $ (0.20) $ (0.54) $ (0.56)
Weighted average number of common shares outstanding:        
Basic (in shares) 18,174,000 17,648,000 18,057,000 17,588,000
Diluted (in shares) 18,174,000 17,648,000 18,057,000 17,588,000
Product        
Sales:        
Net sales $ 17,269 $ 13,949 $ 35,701 $ 27,043
Costs and expenses:        
Costs of sales 11,894 9,554 23,114 19,190
Service        
Sales:        
Net sales 26,094 22,977 49,954 46,451
Costs and expenses:        
Costs of sales $ 16,124 $ 14,378 $ 31,547 $ 29,573