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Summary of Significant Accounting Policies - Foreign Operations (Details) - USD ($) $ in Thousands	Aug. 22, 2024	Sep. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Assets		$ 12,747	$ 15,916
ClearSign Asia Limited | Suspended status
Property, Plant and Equipment [Line Items]
Suspended status, period	3 years
ClearSign Asia Limited
Property, Plant and Equipment [Line Items]
Assets		145	$ 145
Registered capital requirement		350
Capital requirement paid		$ 211
ClearSign Asia Limited | ClearSign Asia Limited | Suspended status
Property, Plant and Equipment [Line Items]
Suspended status, period	3 years

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