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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenue        
Product sales, net $ 40 $ 132 $ 335 $ 482
Revenue from Contract with Customer, Product and Service [Extensible Enumeration] us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember
Other revenue $ 11 $ 11 $ 33 $ 28
Total revenue 51 143 368 510
Cost of revenue        
Cost of revenue $ 187 $ 187 $ 428 $ 493
Cost, Product and Service [Extensible Enumeration] us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember
Gross profit (loss) $ (136) $ (44) $ (60) $ 17
Operating expenses        
Selling, general and administrative expenses 2,850 2,196 7,940 7,639
Research and development expenses 1,077 722 2,735 2,292
Amortization expense 7 32 21 109
Fixed asset impairment   159   159
Total operating expenses 3,934 3,109 10,696 10,199
Loss from operations (4,070) (3,153) (10,756) (10,182)
Nonoperating income (expense)        
Interest income (expense), net (1) 68 (14) 257
Change in fair value of derivative liability 152 (393) 3,027 2,051
Foreign exchange gain (loss) 178 (192) (251) 62
Other income, net 55 7 180 7
Nonoperating income (expense), net 384 (510) 2,942 2,377
Loss before provision for income taxes (3,686) (3,663) (7,814) (7,805)
Provision for income taxes
Net loss (3,686) (3,663) (7,814) (7,805)
Other comprehensive income (loss)        
Foreign currency translation adjustments (182) 191 246 (71)
Comprehensive loss $ (3,868) $ (3,472) $ (7,568) $ (7,876)
Loss per share        
Basic (in dollar per share) $ (0.99) $ (5.49) $ (3.31) $ (13.60)
Diluted (in dollar per share) $ (0.99) $ (5.49) $ (3.31) $ (13.60)
Weighted average number of common shares outstanding        
Basic (in shares) 3,740,625 667,809 2,363,718 573,950
Diluted (in shares) 3,740,625 667,809 2,363,718 573,950