Cash, Cash Equivalents and Short-Term Investments, Net - Schedule of Cash, Cash Equivalents and Net Short-term Investments in Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	$ 754,154	$ 437,353
Short-Term Investments, Net	204,625	186,685
Available For Sale
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	754,154	437,353
Short-Term Investments, Net	204,625	186,685
Total	958,779	624,038
Available For Sale \| Cash
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	272,058	132,372
Total	272,058	132,372
Available For Sale \| Level 1 \| Money Market Funds
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	431,299	259,434
Total	431,299	259,434
Available For Sale \| Level 2 \| Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	47,544	45,547
Short-Term Investments, Net	70,804	63,372
Total	118,348	108,919
Available For Sale \| Level 2 \| Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	3,253
Short-Term Investments, Net	85,425	79,342
Total	88,678	79,342
Available For Sale \| Level 2 \| U.S. Government and Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Short-Term Investments, Net	48,396	43,971
Total	$ 48,396	$ 43,971

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant