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Commitments and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Commitments and Contingencies
Licensed product sales	$ 0	$ 0
Research, Development and Commercialization Agreement | Hoffmann-La Roche ("Roche")
Commitments and Contingencies
Remainder of future milestone payments	$ 8

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