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Stock-Based Compensation - Stock incentive plan and other information (Details) - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 05, 2019	Nov. 02, 2010	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2022	Sep. 17, 2020
Stock-Based Compensation and Warrants
Share-based payment award, options, grants in period, gross					0	0
Unrecognized stock-based compensation expense			$ 934,000,000,000		$ 934,000,000,000
General and Administrative Expenses and Research and Development Expense | Employees
Stock-Based Compensation and Warrants
Allocated share-based compensation expense			118,000	$ 102,000	224,000	$ 184,000
Consultant | General and Administrative Expenses and Research and Development Expense
Stock-Based Compensation and Warrants
Allocated share-based compensation expense			$ 54,000	$ 44,000	$ 108,000	$ 88,000
2010 Stock Plan
Stock-Based Compensation and Warrants
Share-based payment award, options, outstanding, number		8,572	195,782		195,782
Share-based payment award, options, issued, number			198,782		198,782
Share-based compensation arrangement by share-based payment award, number of shares authorized	400,000
Shares available			0		0
2010 Stock Plan | Minimum
Stock-Based Compensation and Warrants
Share-based payment award, options, grants, expired period		5 years
2010 Stock Plan | Maximum
Stock-Based Compensation and Warrants
Share-based payment award, options, grants, expired period		10 years
2020 Stock Plan
Stock-Based Compensation and Warrants
Share-based payment award, options, outstanding, number			4,173,502		4,173,502			400,000
Share-based payment award, options, issued, number			4,173,502		4,173,502
Share-based compensation arrangement by share-based payment award, number of shares authorized							7,000,000

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