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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Total revenues $ 434 $ 906 $ 1,526 $ 2,080
Cost of goods sold (133) (235) (464) (449)
Gross profit 301 671 1,062 1,631
Operating expenses:        
Research and development expenses 4,662 4,065 12,793 14,152
Selling, general and administrative expenses 6,195 4,779 15,147 13,477
Total operating expenses 10,857 8,844 27,940 27,629
Operating loss (10,556) (8,173) (26,878) (25,998)
Change in fair value of warrant liability (9,384) 0 (8,224) 0
Interest expense, net (395) (730) (1,454) (2,040)
Other income (expense) (5) 26 14 2
Net loss (20,340) (8,877) (36,542) (28,036)
Other comprehensive income:        
Foreign currency translation adjustments 5 (46) 24 (82)
Total other comprehensive loss $ (20,335) $ (8,923) $ (36,518) $ (28,118)
Common share data:        
Basic loss per common share (in dollars per share) $ (1.14) $ (0.96) $ (2.61) $ (3.29)
Diluted loss per common share (in dollars per share) $ (1.14) $ (0.96) $ (2.61) $ (3.29)
Weighted average number of basic shares outstanding (in shares) 17,863,078 9,215,786 13,985,248 8,536,006
Weighted average number of diluted shares outstanding (in shares) 17,863,078 9,215,786 13,985,248 8,536,006
Product revenue        
Total revenues $ 434 $ 906 $ 1,526 $ 1,909
Other revenue        
Total revenues $ 0 $ 0 $ 0 $ 171