Risks and Liquidity (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Risks and Liquidity
Accumulated deficit	$ 379,917	$ 358,730

Amount of accumulated undistributed earnings (deficit).

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Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant