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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Assets
Investment in convertible notes receivable	$ 2,000,000	$ 0
Fair Value, Recurring
Assets
Total financial assets	3,148,000	1,612,000
Fair Value, Recurring | Convertible Bonds
Assets
Investment in convertible notes receivable	2,000,000
Fair Value, Recurring | Level 1
Assets
Total financial assets	1,148,000	1,612,000
Fair Value, Recurring | Level 1 | Convertible Bonds
Assets
Investment in convertible notes receivable	0
Fair Value, Recurring | Level 2
Assets
Total financial assets	0	0
Fair Value, Recurring | Level 2 | Convertible Bonds
Assets
Investment in convertible notes receivable	0
Fair Value, Recurring | Level 3
Assets
Total financial assets	2,000,000	0
Fair Value, Recurring | Level 3 | Convertible Bonds
Assets
Investment in convertible notes receivable	2,000,000
Money market funds | Fair Value, Recurring
Assets
Cash equivalents:	1,148,000	1,612,000
Money market funds | Fair Value, Recurring | Level 1
Assets
Cash equivalents:	1,148,000	1,612,000
Money market funds | Fair Value, Recurring | Level 2
Assets
Cash equivalents:	0	0
Money market funds | Fair Value, Recurring | Level 3
Assets
Cash equivalents:	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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