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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	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	$ 426,344	$ 130,876	$ 153,575	$ 207,232
Short-Term Investments	128,974	124,112
Available For Sale
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	426,344	130,876
Short-Term Investments	128,974	124,112
Total	555,318	254,988
Available For Sale | Cash
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	98,070	32,123
Total	98,070	32,123
Available For Sale | Level 1 | Money Market Funds
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	318,745	45,588
Total	318,745	45,588
Available For Sale | Level 1 | Time Deposits
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents		35,000
Total		35,000
Available For Sale | Level 2 | Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	5,030	15,666
Short-Term Investments	25,974	24,975
Total	31,004	40,641
Available For Sale | Level 2 | Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Short-Term Investments	67,117	78,998
Total	67,117	78,998
Available For Sale | Level 2 | U.S. Government and Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	4,499	2,499
Short-Term Investments	35,883	20,139
Total	$ 40,382	$ 22,638

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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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