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Goodwill and Intangible Assets, Net - Schedule of Goodwill and Intangible Assets Net (Details) (Parenthetical) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Mar. 01, 2019
Indefinite-Lived Intangible Assets [Line Items]                
Fair value of intangible assets $ 31,700,000       $ 31,700,000   $ 46,540,000  
Loss on impairment of intangible asset 0   $ 0   14,840,000 $ 0    
Amortization of intangible assets       $ 22,000 0 $ 22,000    
IPR&D - VAC2 [Member]                
Indefinite-Lived Intangible Assets [Line Items]                
Fair value of intangible assets $ 0 [1]       $ 0 [1]   $ 14,840,000 [1] $ 14,800,000
Loss on impairment of intangible asset   $ 14,800,000            
In Process Research and Development [Member]                
Indefinite-Lived Intangible Assets [Line Items]                
Fair value of intangible assets               46,500,000
IPR&D - OPC1 [Member]                
Indefinite-Lived Intangible Assets [Line Items]                
Fair value of intangible assets               $ 31,700,000
[1] Asterias had two IPR&D intangible assets that were valued at $46.5 million as part of the purchase price allocation that was performed in connection with the Asterias Merger. The fair value of these assets at the acquisition date consisted of $31.7 million pertaining to the OPC1 program and $14.8 million pertaining to the VAC platform. As of June 30, 2025, the VAC platform was deemed to be abandoned. As the Company has abandoned the VAC platform and its related research and development efforts, and the IPR&D asset has no alternative future use, the Company derecognized the intangible asset and recorded a non-cash pre-tax impairment charge during the quarter ending June 30, 2025 of $14.8 million, within total operating expenses of the condensed consolidated statement of operations. See Note 13 (Commitments and Contingencies) for additional information.