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Fair Value Measurements (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Summary of financial instruments measured at fair value on a recurring basis
Asset, held-for-sale, not part of disposal group	$ 600,000		$ 600,000
Convertible Debt
Summary of financial instruments measured at fair value on a recurring basis
Credit losses	0	$ 0	0	$ 0
Other-than-temporary impairment losses	0	$ 0	0	$ 0
Money Market Funds
Summary of financial instruments measured at fair value on a recurring basis
Money market funds	65,585,000		65,585,000		$ 77,309,000
Level 1 | Money Market Funds
Summary of financial instruments measured at fair value on a recurring basis
Money market funds	65,585,000		65,585,000		77,309,000
Level 2 | Money Market Funds
Summary of financial instruments measured at fair value on a recurring basis
Money market funds	0		0		0
Level 3 | Money Market Funds
Summary of financial instruments measured at fair value on a recurring basis
Money market funds	$ 0		$ 0		$ 0

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482309/360-10-15-4

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- Definition

Amount of unrealized loss on 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/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

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.

+ References

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- Definition

Amount of writeoff of allowance for credit loss on 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 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

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