Investments - Summary of Financial Assets Recorded at Fair Value On Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair value measurements
Total financial assets	$ 204,944	$ 602,617
U.S. Treasury Instruments
Fair value measurements
Cash and cash equivalents	9,996	301,992
Investments in securities	171,114	200,973
Warrants
Fair value measurements
Investments in securities	537	684
Money Market Securities
Fair value measurements
Cash and cash equivalents	11,066	83,004
Common Stock
Fair value measurements
Investments in securities	12,231	15,964
Level 1
Fair value measurements
Total financial assets	12,768	16,648
Level 1 \| Warrants
Fair value measurements
Investments in securities	537	684
Level 1 \| Common Stock
Fair value measurements
Investments in securities	12,231	15,964
Level 2
Fair value measurements
Total financial assets	192,176	585,969
Level 2 \| U.S. Treasury Instruments
Fair value measurements
Cash and cash equivalents	9,996	301,992
Investments in securities	171,114	200,973
Level 2 \| Money Market Securities
Fair value measurements
Cash and cash equivalents	$ 11,066	$ 83,004

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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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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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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