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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenue $ 597 $ 378
Cost of goods sold (181) (33)
Gross profit 416 345
Operating expenses:    
Research and development expenses 4,576 4,481
Selling, general and administrative expenses 4,165 4,204
Total operating expenses 8,741 8,685
Operating loss (8,325) (8,340)
Interest expense, net (688) (645)
Other income (loss) 13 (15)
Net loss (9,000) (9,000)
Other comprehensive income:    
Foreign currency translation adjustments 19 2
Total other comprehensive loss $ (8,981) $ (8,998)
Common share data:    
Basic loss per common share $ (0.77) $ (1.1)
Diluted loss per common share $ (0.77) $ (1.1)
Weighted average number of basic shares outstanding 11,622,384 8,190,483
Weighted average number of diluted shares outstanding 11,622,384 8,190,483
Product Revenue [Member]    
Revenue $ 597 $ 207
Other Revenue [Member]    
Revenue $ 0 $ 171