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Stock-Based Compensation - Stock incentive plan and other information (Details) - USD ($)			3 Months Ended
	Sep. 05, 2019	Nov. 02, 2010	Mar. 31, 2025	Mar. 31, 2024	Sep. 17, 2020
Stock-Based Compensation
Share-based payment award, options, grants in period, gross			0	0
Unrecognized stock-based compensation expense			$ 495,000
General and administrative expenses and research and development expense \| Employees
Stock-Based Compensation
Allocated share-based compensation expense			84,000	$ 106,000
Consultant \| General and administrative expenses and research and development expense
Stock-Based Compensation
Allocated share-based compensation expense			$ 16,000	$ 54,000
2010 Stock Plan
Stock-Based Compensation
Share-based payment award, options, outstanding, number		343
Share-based compensation arrangement by share-based payment award, number of shares authorized	16,000
Share-based compensation arrangement by share-based payment award, shares issued			0
2010 Stock Plan \| Board of Directors
Stock-Based Compensation
Share-based payment award, options, outstanding, number			7,670
Share-based payment award, options, issued, number			7,670
2010 Stock Plan \| Minimum
Stock-Based Compensation
Share-based payment award, options, grants, expired period		5 years
2010 Stock Plan \| Maximum
Stock-Based Compensation
Share-based payment award, options, grants, expired period		10 years
2020 Stock Plan
Stock-Based Compensation
Share-based payment award, options, outstanding, number			167,364		16,000
Share-based compensation arrangement by share-based payment award, number of shares authorized			2,500,000
Share-based payment award, options, issued, number			167,364