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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Cost of goods sold $ (180) $ (202) $ (214) $ (314)
Gross profit 617 334 960 610
Operating expenses:        
Research and development expenses 5,456 3,497 9,696 7,204
Selling, general and administrative expenses 4,145 3,288 7,791 6,584
Total operating expenses 9,601 6,785 17,487 13,788
Operating loss (8,984) (6,451) (16,527) (13,178)
Interest expense, net (665) (40) (1,309) (81)
Other (loss) income (8) 61 (24) 82
Net loss (9,657) (6,430) (17,860) (13,177)
Other comprehensive income:        
Foreign currency translation adjustments (31) (61) (29) 33
Total other comprehensive loss $ (9,688) $ (6,491) $ (17,889) $ (13,144)
Common share data:        
Basic loss per common share $ (1.18) $ (0.96) $ (2.18) $ (2)
Diluted loss per common share $ (1.18) $ (0.96) $ (2.18) $ (2)
Weighted average number of basic shares outstanding 8,190,483 6,681,369 8,190,483 6,589,655
Weighted average number of diluted shares outstanding 8,190,483 6,681,369 8,190,483 6,589,655
Product Revenue [Member]        
Revenue $ 797 $ 398 $ 1,003 $ 659
Other Revenue [Member]        
Revenue $ 0 $ 138 $ 171 $ 265