Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Marketable securities:
Total cash equivalents and marketable securities	$ 498,353
Level 1
Marketable securities:
Total cash equivalents and marketable securities	268,666
Level 2
Marketable securities:
Total cash equivalents and marketable securities	229,687
Money Market Funds
Cash equivalents:
Money market funds	268,666
Money Market Funds \| Level 1
Cash equivalents:
Money market funds	268,666
Corporate Debt Securities
Cash equivalents:
Money market funds	12,152
Marketable securities:
Corporate debt securities	202,496
Corporate Debt Securities \| Level 2
Cash equivalents:
Money market funds	12,152
Marketable securities:
Corporate debt securities	202,496
U.S. Government Debt Securities
Marketable securities:
Corporate debt securities	10,041
U.S. Government Debt Securities \| Level 2
Marketable securities:
Corporate debt securities	10,041
U.S. Treasury Securities
Marketable securities:
Corporate debt securities	4,998
U.S. Treasury Securities \| Level 2
Marketable securities:
Corporate debt securities	$ 4,998

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)
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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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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
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-SubTopic 10
-Section 50
-Paragraph 2
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