Commitments and Contingencies - Additional information (Details) $ in Millions	1 Months Ended			3 Months Ended
	Mar. 31, 2025 USD ($) ft²	Feb. 28, 2025 USD ($) ft²	Jun. 30, 2023 USD ($) ft²	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)
Commitments and Contingencies
Operating lease cost				$ 1.2	$ 0.8
Short-term lease costs				$ 0.4	0.3
Weighted average remaining lease term (in years)				2 years 8 months 12 days
Weighted average discount rate (as percent)				7.70%
Cash paid				$ 0.8	$ 0.6
Shanghai ShouTi | Office Space Lease
Commitments and Contingencies
Area of office space (in sq ft) | ft²			22,500
Annual base rent			$ 0.7
Shanghai ShouTi | Lab Lease
Commitments and Contingencies
Area of space leased (in square feet) | ft²			8,400
Annual base rent			$ 0.3
Shanghai ShouTi | Office and laboratory space lease
Commitments and Contingencies
Area of space leased (in square feet) | ft²	5,000
Annual base rent	$ 0.3
Structure USA | Office Space Lease
Commitments and Contingencies
Area of space leased (in square feet) | ft²		22,365
Annual base rent		$ 1.0
Percentage of increase to annual base rent		3.00%
Area of subleased space (in square feet) | ft²			11,800
Sub lease annual base rent			$ 0.5
Sub lease, percentage of increase to annual base rent			3.00%