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- Definition

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

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

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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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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No definition available.

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- Definition

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

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- Definition

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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- Definition

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

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- Definition

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		9 Months Ended
	Sep. 27, 2022	Jul. 19, 2022	Feb. 19, 2019	Sep. 28, 2018	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	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							$ 2.23	$ 1.97
Unrecognized share based compensation					$ 1.9		$ 1.9
Unrecognized share based compensation, period							4 years
Inducement Awards [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, reserved for future issuance					194,837		194,837
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					926,085		926,085
Stock Options and Restricted Stock Awards [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based compensation					$ 0.4	$ 0.7	$ 2.0	$ 3.1
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	0.2	0.7	1.1
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					$ 0.3	$ 0.5	$ 1.3	$ 2.0
Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares issued, shares							1,328,274	2,975,503
2018 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, shares authorized												180,000
Common stock, reserved for future issuance					946,454		946,454
2018 Stock Incentive Plan [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based payment award, shares granted									513,333	166,667	80,000
2018 Stock Incentive Plan [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based payment award, shares granted									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] \| Eight New Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options granted, weighted average exercise price	$ 1.65	$ 1.95	$ 32.70	$ 41.55
Inducement Option Grants [Member] \| Eight New Employees [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares issued, shares	2,250	53,000	8,666	1,266
Inducement Option Grants [Member] \| Eight New Employees [Member] \| Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares issued, shares	8,501	177,000	4,668	4,668
Inducement Option Grants [Member] \| Minimum [Member] \| Eight New Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based payment award vesting period			3 years
Inducement Option Grants [Member] \| Maximum [Member] \| Eight New Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share based payment award vesting period			4 years
2018 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, reserved for future issuance					18,088		18,088
2007 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, reserved for future issuance					18,088		18,088