Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items]
Operating segments \| segment	1
Reportable segments \| segment	1
Operating lease right-of-use assets	$ 10	$ 283
Operating Lease, Liability	40
Long-term Debt	1,023
Accumulated deficit	(421,361)	(401,783)
Accounting Standards Update 2016-02 [Member]
Significant Accounting Policies [Line Items]
Operating lease right-of-use assets		560
Operating Lease, Liability		$ 600
Accounting Standards Update 2020-06 [Member]
Significant Accounting Policies [Line Items]
Long-term Debt	800
Accumulated deficit	300
Additional Paid in Capital	$ (1,100)
Patents And Copyrights [Member] \| Minimum [Member]
Significant Accounting Policies [Line Items]
Intangible assets, useful life	15 years
Patents And Copyrights [Member] \| Maximum [Member]
Significant Accounting Policies [Line Items]
Intangible assets, useful life	20 years

Significant Accounting Policies [Line Items]

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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Amount of lessee's right to use underlying asset under operating lease.

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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