Condensed Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock Public offering	Common Stock Private Placement	Common Stock	Additional Paid-in Capital Public offering	Additional Paid-in Capital Private Placement	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Public offering	Private Placement	Total
Beginning Balance at Dec. 31, 2023			$ 4,000			$ 98,922,000	$ (17,000)	$ (93,717,000)			$ 5,192,000
Beginning Balances (in shares) at Dec. 31, 2023			38,687,000
Share-based compensation						67,000					67,000
Share-based compensation (in shares)			67,000
Fair value of stock issued in payment of accrued compensation						326,000					326,000
Fair value of stock issued in payment of accrued compensation (in shares)			307,000
Shares issued for services						3,000					3,000
Shares issued for services (per share) (in shares)			4,000
Tax withholdings related to share-based compensation						(16,000)					(16,000)
Tax withholdings related to share-based compensation (in shares)			(22,000)
Foreign-exchange translation adjustment							(3,000)				(3,000)
Net loss								(1,108,000)			(1,108,000)
Ending Balance at Mar. 31, 2024			$ 4,000			99,302,000	(20,000)	(94,825,000)			4,461,000
Ending Balances (in shares) at Mar. 31, 2024			39,043,000
Beginning Balance at Dec. 31, 2023			$ 4,000			98,922,000	(17,000)	(93,717,000)			5,192,000
Beginning Balances (in shares) at Dec. 31, 2023			38,687,000
Net loss											(4,135,000)
Ending Balance at Sep. 30, 2024			$ 5,000			112,686,000	(16,000)	(97,852,000)			14,823,000
Ending Balances (in shares) at Sep. 30, 2024			50,235,000
Beginning Balance at Mar. 31, 2024			$ 4,000			99,302,000	(20,000)	(94,825,000)			4,461,000
Beginning Balances (in shares) at Mar. 31, 2024			39,043,000
Share-based compensation						344,000					344,000
Share-based compensation (in shares)			256,000
Shares issued for services						3,000					3,000
Shares issued for services (per share) (in shares)			4,000
Issuance of common stock in offering, net of expenses	$ 1,000			$ 2,390,000	$ 865,000				$ 2,391,000	$ 865,000
Issuance of common stock in offering, net of expenses (in shares)	5,314,000	2,250,000
Issuance of prefunded warrants in private placement, net of expenses					1,214,000					1,214,000
Issuance of warrants in offering, net of expenses				$ 1,831,000	$ 2,389,000				$ 1,831,000	$ 2,389,000
Issuance of common stock for participation right exercise, net of expenses						1,447,000					1,447,000
Issuance of common stock for participation right exercise, net of expenses (in shares)			3,350,000
Issuance of prefunded warrants for participation right exercise, net of expenses						580,000					580,000
Issuance of warrants for participation right exercise, net of expenses						2,250,000					2,250,000
Tax withholdings related to share-based compensation						(13,000)					(13,000)
Tax withholdings related to share-based compensation (in shares)			(11,000)
Foreign-exchange translation adjustment							(1,000)				(1,000)
Net loss								(1,872,000)			(1,872,000)
Ending Balance at Jun. 30, 2024			$ 5,000			112,602,000	(21,000)	(96,697,000)			15,889,000
Ending Balances (in shares) at Jun. 30, 2024			50,206,000
Share-based compensation						73,000					73,000
Shares issued for services						20,000					20,000
Shares issued for services (per share) (in shares)			29,000
Tax withholdings related to share-based compensation						(9,000)					(9,000)
Foreign-exchange translation adjustment							5,000				5,000
Net loss								(1,155,000)			(1,155,000)
Ending Balance at Sep. 30, 2024			$ 5,000			112,686,000	(16,000)	(97,852,000)			14,823,000
Ending Balances (in shares) at Sep. 30, 2024			50,235,000
Beginning Balance at Dec. 31, 2024			$ 5,000			112,796,000	(21,000)	(99,016,000)			13,764,000
Beginning Balances (in shares) at Dec. 31, 2024			50,286
Share-based compensation						45,000					45,000
Share-based compensation (in shares)			81
Fair value of stock issued in payment of accrued compensation						279,000					279,000
Fair value of stock issued in payment of accrued compensation (in shares)			326
Shares issued for services						4,000					4,000
Shares issued for services (per share) (in shares)			4
Exercise of warrants			$ 23			24,000					24,000
Exercise of prefunded warrants (in shares)			1,703
Net loss								(2,076,000)			(2,076,000)
Ending Balance at Mar. 31, 2025			$ 5,000			113,148,000	(21,000)	(101,092,000)			12,040,000
Ending Balances (in shares) at Mar. 31, 2025			52,423
Beginning Balance at Dec. 31, 2024			$ 5,000			112,796,000	(21,000)	(99,016,000)			13,764,000
Beginning Balances (in shares) at Dec. 31, 2024			50,286
Net loss											(5,185,000)
Ending Balance at Sep. 30, 2025			$ 5,000			113,294,000	(20,000)	(104,201,000)			9,078,000
Ending Balances (in shares) at Sep. 30, 2025			52,517
Beginning Balance at Mar. 31, 2025			$ 5,000			113,148,000	(21,000)	(101,092,000)			12,040,000
Beginning Balances (in shares) at Mar. 31, 2025			52,423
Share-based compensation						51,000					51,000
Shares issued for services						3,000					3,000
Shares issued for services (per share) (in shares)			3
Net loss								(1,680,000)			(1,680,000)
Ending Balance at Jun. 30, 2025			$ 5,000			113,202,000	(21,000)	(102,772,000)			10,414,000
Ending Balances (in shares) at Jun. 30, 2025			52,426
Share-based compensation						38,000					38,000
Shares issued for services						54,000					54,000
Shares issued for services (per share) (in shares)			91
Foreign-exchange translation adjustment							1,000				1,000
Net loss								(1,429,000)			(1,429,000)
Ending Balance at Sep. 30, 2025			$ 5,000			$ 113,294,000	$ (20,000)	$ (104,201,000)			$ 9,078,000
Ending Balances (in shares) at Sep. 30, 2025			52,517

ClearSign Technologies Corp 10-Q