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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring basis - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial assets
Total financial assets	$ 786,641	$ 674,408
Level 1
Financial assets
Total financial assets	103,283	88,683
Level 2
Financial assets
Total financial assets	683,358	585,725
Money Market Funds
Financial assets
Total financial assets	103,283	88,683
Money Market Funds | Level 1
Financial assets
Total financial assets	103,283	88,683
U.S. Government Debt Securities
Financial assets
Total financial assets	671,777	377,243
U.S. Government Debt Securities | Level 2
Financial assets
Total financial assets	671,777	377,243
Corporate Bonds
Financial assets
Total financial assets	11,581	86,615
Corporate Bonds | Level 2
Financial assets
Total financial assets	$ 11,581	86,615
Commercial Paper
Financial assets
Total financial assets		121,867
Commercial Paper | Level 2
Financial assets
Total financial assets		$ 121,867

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- Definition

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

+ References

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=117815213&loc=d3e19207-110258

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