Goodwill and Intangible Assets, Net - Schedule of Goodwill and Intangible Assets Net (Details) (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
IPR&D - VAC2 [Member]
Indefinite-Lived Intangible Assets [Line Items]
Fair value of intangible assets	[1]	$ 14,840	$ 14,840
In Process Research and Development [Member]
Indefinite-Lived Intangible Assets [Line Items]
Fair value of intangible assets		46,500
IPR&D - OPC1 [Member]
Indefinite-Lived Intangible Assets [Line Items]
Fair value of intangible assets		$ 31,700

[1] Asterias had two in-process research and development ("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.