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Business Combination - Schedule of allocation of fair value of assets and liabilities acquired (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Mar. 10, 2022
Business Combination      
Goodwill $ 5,700,000 $ 5,525,000  
In-process R&D deferred tax liabilities 4,992,000 4,787,000  
In-process R&D decrease in goodwill   607,000  
Measurement period adjustment related to the estimate of acquired liabilities   277,000  
V C N      
Business Combination      
Cash and cash equivalents     $ 837,000
Receivables     1,889,000
Property and equipment     216,000
In-process research and development intangible asset     19,742,000
Goodwill 5,700,000   5,696,000
Deferred tax liabilities, net     (3,209,000)
Accounts payable     (522,000)
Accrued expenses     (113,000)
Accrued employee benefits     (90,000)
Loans payable-current     (67,000)
Other long-term liabilities     (1,570,000)
Total purchase consideration     $ 22,809,000
Indefinite-lived in-process research and development intangible asset 19,700,000    
Net loss of V C N operations 11,400,000 5,800,000  
increase in other receivables 176,000 176,000  
In-process R&D measurement period adjustment 810,000 810,000  
In-process R&D deferred tax liabilities 202,000 $ 202,000  
In-process R&D decrease in goodwill 1,061,000    
conjunction with the Acquisition 0    
Measurement period adjustment related to the estimate of acquired liabilities $ 277,000