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Commitments (Narrative) (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) ft²	Mar. 31, 2022 USD ($)
Operating Leased Assets [Line Items]
Cash paid for operating lease liabilities	$ 24,000	$ 41,000
Buildings [Member]
Operating Leased Assets [Line Items]
Rent expense	$ 24,000	$ 41,000
Austin, Texas [Member] | Operating Leases [Member]
Operating Leased Assets [Line Items]
Office space | ft²	6,000
Lease expiration date	Apr. 30, 2024

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Date which lease or group of leases is set to expire, in YYYY-MM-DD format.

+ References

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X

- Definition

Net rentable area for properties owned.

+ References

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X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

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X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

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- Definition

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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