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Number of options issued, including both vested and non-vested options.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Number of shares issued under share-based payment arrangement.

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Number of share options (or share units) exercised during the current period.

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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, 2023	Mar. 31, 2022	Sep. 17, 2020	Mar. 20, 2007
Stock-Based Compensation and Warrants
Share-based payment award, options, grants in period, gross			0	0
Unrecognized stock-based compensation expense			$ 841,000
Stock issued for exercise of stock options (in shares)				0
General and administrative expenses \| Employees
Stock-Based Compensation and Warrants
Allocated share-based compensation expense			83,000	$ 59,000
Research and Development Expenses \| Employees
Stock-Based Compensation and Warrants
Allocated share-based compensation expense			$ 43,000	$ 53,000
2007 Stock Plan
Stock-Based Compensation and Warrants
Share-based payment award, options, outstanding, number			372			7,143
Share-based payment award, options, issued, number			$ 372
2010 Stock Plan
Stock-Based Compensation and Warrants
Share-based payment award, options, outstanding, number		8,572
Share-based compensation arrangement by share-based payment award, number of shares authorized	400,000
Share-based compensation arrangement by share-based payment award, shares issued			0	0
2010 Stock Plan \| Board of Directors
Stock-Based Compensation and Warrants
Share-based payment award, options, outstanding, number			202,095
Share-based payment award, options, issued, number			$ 202,095
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			2,093,002		400,000
Share-based compensation arrangement by share-based payment award, number of shares authorized			7,000,000