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Summary of Significant Accounting Policies - Foreign Operations (Details) - USD ($) $ in Thousands		3 Months Ended
	Aug. 22, 2024	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Assets			$ 15,916	$ 7,620
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	$ 334
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
Accrual related costs Included in accounts payable and accrued liabilities			$ 239
One-time non-recurring accrual estimate related to our decision to suspend our China operations		$ 394

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