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Cash, Cash Equivalents and Short-term Investments - Summary of Estimated Value of Cash, Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	$ 547,859	$ 350,846
Cash and cash equivalents, fair value	547,859	350,846
Short-term investments, amortized cost		4,006
Short-term investments, unrealized gain		11
Short-term investments, fair value		4,017
Cash
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	343,491	150,520
Cash and cash equivalents, fair value	343,491	150,520
Money Market Funds
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	204,368	200,326
Cash and cash equivalents, fair value	$ 204,368	200,326
Corporate Bonds
Cash And Cash Equivalents [Line Items]
Short-term investments, amortized cost		4,006
Short-term investments, unrealized gain		11
Short-term investments, fair value		$ 4,017

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- Definition

Cash and cash equivalents, amortized Cost.

+ References

No definition available.

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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