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Fair Value of Financial Instruments - Financial Assets Carried at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Non-current assets:
Long-term investments	$ 105,287	$ 199,965
Marketable equity investments	5,020	8,600
Level 1
Non-current assets:
Long-term investments	0	0
Marketable equity investments	5,020	8,600
Level 2
Non-current assets:
Long-term investments	0	0
Marketable equity investments	0	0
Level 3
Non-current assets:
Long-term investments	105,287	199,965
Marketable equity investments	0	0
Money market funds
Cash equivalents:
Money market funds	222,578	175,663
Money market funds | Level 1
Cash equivalents:
Money market funds	222,578	175,663
Money market funds | Level 2
Cash equivalents:
Money market funds	0	0
Money market funds | Level 3
Cash equivalents:
Money market funds	$ 0	$ 0

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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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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-Publisher FASB
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