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Cash, Cash Equivalents and Short -Term Investments - Schedule of Cash, Cash Equivalents and Short-term Investments in Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	$ 576,916	$ 437,353
Short-Term Investments	221,685	186,685
Available For Sale
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	576,916	437,353
Short-Term Investments	221,685	186,685
Total	798,601	624,038
Available For Sale | Cash
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	141,689	132,372
Total	141,689	132,372
Available For Sale | Level 1 | Money Market Funds
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	403,952	259,434
Total	403,952	259,434
Available For Sale | Level 2 | Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	31,275	45,547
Short-Term Investments	84,253	63,372
Total	115,528	108,919
Available For Sale | Level 2 | Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Short-Term Investments	94,080	79,342
Total	94,080	79,342
Available For Sale | Level 2 | U.S. Government and Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Short-Term Investments	43,352	43,971
Total	$ 43,352	$ 43,971

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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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