Schedule of Goodwill and Intangible Assets, Net (Details) (Parenthetical) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Intangible assets acquired $ 46,500,000  
Fair value of intangible assets 66,143,000 $ 66,143,000
Unamortized remaining balance 282,000  
IPR&D - OPC1 [Member]    
Finite-Lived Intangible Assets [Line Items]    
Fair value of intangible assets [1] 31,700,000 31,700,000
IPR&D - VAC2 [Member]    
Finite-Lived Intangible Assets [Line Items]    
Fair value of intangible assets [1] $ 14,840,000 $ 14,840,000
[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 consisted of $31.7 million pertaining to the OPC1 program and $14.8 million pertaining to the VAC2 program.