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

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of new stock issued during the period.

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Stock-Based Compensation (Details Narrative) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended
	Mar. 17, 2023	Dec. 13, 2022	Sep. 27, 2022	Jul. 19, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Jun. 10, 2021	Jun. 15, 2020	May 14, 2019	May 15, 2018
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options granted, weighted average exercise price					$ 1.32	$ 4.16
Common stock, outstanding					9,097,005		7,436,197
Unrecognized share based compensation					$ 0.8
Inducement Awards [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, outstanding					209,751
Equity Stock Awards [Member] \| Granted Under 2018 Plan and 2007 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, reserved for future issuance					844,697
Stock Options and Restricted Stock Awards [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based compensation					$ 0.3	$ 1.0
Stock Options and Restricted Stock Awards [Member] \| Research and Development Expense [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based compensation					0.1	0.4
Stock Options and Restricted Stock Awards [Member] \| General and Administrative Expense [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based compensation					$ 0.2	$ 0.6
Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares issued, shares					1,660,608
Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, outstanding					400,000
Unrecognized share based compensation, period					3 years
Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, outstanding					6,600,000
Unrecognized share based compensation, period					4 years
2018 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, shares authorized											180,000
Shares available for issuance					100,376
Common stock, reserved for future issuance					945,073
2018 Stock Incentive Plan [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares available for issuance								513,333	166,667	80,000
2018 Stock Incentive Plan [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares available for issuance								940,000	426,667	260,000
2007 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock options, strike price description					Options are generally granted with strike prices equal to the fair market value of a share of common stock on the date of grant. Incentive stock options may be granted to purchase shares of common stock at a price not less than 100% of the fair market value of the underlying shares on the date of grant, provided that the exercise price of any incentive stock option granted to an eligible employee owning more than 10% of the outstanding stock of the Company must be at least 110% of such fair market value on the date of grant. Only officers and key employees may receive incentive stock options.
Inducement Option Grants [Member] \| Ten New Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options granted, weighted average exercise price	$ 1.32	$ 1.40	$ 1.65	$ 1.95
Inducement Option Grants [Member] \| Ten New Employees [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares issued, shares	1,100	4,000	2,250	63,000
Inducement Option Grants [Member] \| Ten New Employees [Member] \| Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares issued, shares	5,230	19,000	8,501	177,000