Cash, Cash Equivalents, and Investments - Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 396,283	$ 349,462
Gross Unrealized Gains	107	0
Gross Unrealized Losses	(34)	0
Fair Value	396,356	349,462
Cash and Cash Equivalents	172,250	349,462
Short-Term Investments	178,534	0
Long-Term Investments	45,499	0
Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	41,714
Gross Unrealized Gains	14
Gross Unrealized Losses	(4)
Fair Value	41,724
Cash and Cash Equivalents	8,845
Short-Term Investments	15,131
Long-Term Investments	17,738
Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	251,250
Gross Unrealized Gains	93
Gross Unrealized Losses	(30)
Fair Value	251,313
Cash and Cash Equivalents	60,086
Short-Term Investments	163,403
Long-Term Investments	27,761
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	103,319	144,095
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	103,319	144,095
Cash and Cash Equivalents	103,319	144,095
Short-Term Investments	0	0
Long-Term Investments	0	0
Money market funds \| Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	8,845	205,367
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	8,845	205,367
Cash and Cash Equivalents	8,845	205,367
Short-Term Investments	0	0
Long-Term Investments	0	$ 0
Agency bonds \| Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	32,869
Gross Unrealized Gains	14
Gross Unrealized Losses	(4)
Fair Value	32,879
Cash and Cash Equivalents	0
Short-Term Investments	15,131
Long-Term Investments	17,738
State and municipal obligations \| Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	25,038
Gross Unrealized Gains	8
Gross Unrealized Losses	0
Fair Value	25,046
Cash and Cash Equivalents
Short-Term Investments	21,560
Long-Term Investments	3,478
Certificates of deposit \| Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	1,400
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	1,400
Cash and Cash Equivalents	0
Short-Term Investments	1,400
Long-Term Investments	0
Corporate bonds \| Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	135,175
Gross Unrealized Gains	71
Gross Unrealized Losses	(30)
Fair Value	135,216
Cash and Cash Equivalents	886
Short-Term Investments	113,241
Long-Term Investments	21,048
U.S. Treasury repurchase agreements \| Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	57,200
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	57,200
Cash and Cash Equivalents	57,200
Short-Term Investments	0
Long-Term Investments	0
Treasury inflation-protected securities \| Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	3,235
Gross Unrealized Gains	14
Gross Unrealized Losses	0
Fair Value	3,249
Cash and Cash Equivalents	0
Short-Term Investments	0
Long-Term Investments	3,235
Commercial paper \| Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	29,202
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	29,202
Cash and Cash Equivalents	2,000
Short-Term Investments	27,202
Long-Term Investments	$ 0

Cash cash equivalent and investments amortized cost.

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- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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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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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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