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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Cost of goods sold $ (235) $ (227) $ (449) $ (541)
Gross profit 671 295 1,631 906
Operating expenses:        
Research and development expenses 3,953 2,955 13,649 10,159
Selling, general and administrative expenses 4,519 4,036 12,309 10,621
Total operating expenses 8,472 6,991 25,958 20,780
Operating loss (7,801) (6,696) (24,327) (19,874)
Interest expense, net (730) (420) (2,040) (501)
Other income (expense) 26 (9) 2 73
Net loss (8,505) (7,125) (26,365) (20,302)
Other comprehensive (loss) income:        
Foreign currency translation adjustments (46) 51 (82) 84
Total other comprehensive loss $ (8,551) $ (7,074) $ (26,447) $ (20,218)
Common share data:        
Basic loss per common share $ (0.92) $ (0.94) $ (3.09) $ (2.93)
Diluted loss per common share $ (0.92) $ (0.94) $ (3.09) $ (2.93)
Weighted average number of basic shares outstanding 9,215,786 7,587,643 8,536,006 6,923,541
Weighted average number of diluted shares outstanding 9,215,786 7,587,643 8,536,006 6,923,541
Product Revenue [Member]        
Revenue $ 906 $ 395 $ 1,909 $ 1,054
Other Revenue [Member]        
Revenue $ 0 $ 127 $ 171 $ 393