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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Total revenues $ 495 $ 797 $ 1,092 $ 1,174
Cost of goods sold (150) (180) (331) (214)
Gross profit 345 617 761 960
Operating expenses:        
Research and development expenses 3,555 5,606 8,131 10,087
Selling, general and administrative expenses 4,787 4,497 8,952 8,699
Total operating expenses 8,342 10,103 17,083 18,786
Operating loss (7,997) (9,486) (16,322) (17,826)
Change in fair value of warrant liability 1,160 0 1,160 0
Interest expense, net (371) (665) (1,059) (1,309)
Other income (expense) 6 (8) 19 (24)
Net loss (7,202) (10,159) (16,202) (19,159)
Other comprehensive income:        
Foreign currency translation adjustments 0 (31) 19 (29)
Total other comprehensive loss $ (7,202) $ (10,190) $ (16,183) $ (19,188)
Common share data:        
Basic loss per common share (in dollars per share) $ (0.58) $ (1.24) $ (1.35) $ (2.34)
Diluted loss per common share (in dollars per share) $ (0.58) $ (1.24) $ (1.35) $ (2.34)
Weighted average number of basic shares outstanding (in shares) 12,463,665 8,190,483 12,035,738 8,190,483
Weighted average number of diluted shares outstanding (in shares) 12,463,665 8,190,483 12,035,738 8,190,483
Product revenue        
Total revenues $ 495 $ 797 $ 1,092 $ 1,003
Other revenue        
Total revenues $ 0 $ 0 $ 0 $ 171