Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Increase (decrease) in carrying value of IPR&D due to foreign currency translation	$ (0.2)	$ (1.5)

Increase decrease in process research and development due to foreign currency translation.

No definition available.

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Namespace Prefix:	svra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration