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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cost of goods sold $ (33) $ (112)
Gross profit 345 276
Operating expenses:    
Research and development expenses 4,240 3,707
Selling, general and administrative expenses 3,648 3,296
Total operating expenses 7,888 7,003
Operating loss (7,543) (6,727)
Interest expense, net (645) (41)
Other income (expense), net (15) 21
Net loss (8,203) (6,747)
Other comprehensive income:    
Foreign currency translation adjustments 2 94
Total other comprehensive loss $ (8,201) $ (6,653)
Common share data:    
Basic and diluted loss per common share $ (1.00) $ (1.04)
Weighted average number of basic and diluted shares outstanding 8,190,483 6,496,922
Product Revenue [Member]    
Revenue $ 207 $ 261
Other Revenue [Member]    
Revenue $ 171 $ 127