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Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Patents, licenses, and other intangible assets
Impairment of intangible assets	$ 0	$ 0	$ 0	$ 0
Abandonment of capitalized intangible assets			594,000	1,047,000
Impairment loss or recoveries	0	0	0	0
Net unrealized gain (loss) on marketable debt securities	1,765,000	(1,823,000)	5,093,000	(7,435,000)
Equity securities impairment	0	100,000	0	100,000
Preferred Stock
Patents, licenses, and other intangible assets
Equity shares estimated fair value	64,209,000		64,209,000		$ 54,383,000
Zenas | Preferred Stock
Patents, licenses, and other intangible assets
Equity shares estimated fair value	64,209,000		64,209,000		$ 54,209,000
Zenas | Milestone | Preferred Stock | License Agreement
Patents, licenses, and other intangible assets
Equity shares estimated fair value	10,000,000		10,000,000
In-process intangible assets
Patents, licenses, and other intangible assets
Abandonment of capitalized intangible assets	$ 300,000	$ 700,000	$ 600,000	$ 1,000,000

X

- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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+ References

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The expense charged against earnings to eliminate the capitalized costs of projects that have been terminated during the reporting period, which is added back to net income when calculating cash provided by (used in) operations using the indirect method.

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