Cash, Cash Equivalents, and Investments - Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 352,855	$ 349,462
Gross Unrealized Gains	56	0
Gross Unrealized Losses	(38)	0
Fair Value	352,873	349,462
Cash and Cash Equivalents	202,551	349,462
Short-term investments	108,913	0
Long-term Investments	41,391	0	$ 41,391
Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	70,145
Gross Unrealized Gains	4
Gross Unrealized Losses	(6)
Fair Value	70,143
Cash and Cash Equivalents	49,379
Short-term investments	2,000
Long-term Investments			18,766
Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	202,441
Gross Unrealized Gains	52
Gross Unrealized Losses	(32)
Fair Value	202,461
Cash and Cash Equivalents	72,903
Short-term investments	106,913
Long-term Investments			22,625
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	80,269	144,095
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	80,269	144,095
Cash and Cash Equivalents	80,269	144,095
Short-term investments	0	0
Long-term Investments		0	0
Money market funds \| Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	37,311	205,367
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	37,311	205,367
Cash and Cash Equivalents	37,311	205,367
Short-term investments	0	0
Long-term Investments		$ 0	0
Agency bonds \| Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	32,834
Gross Unrealized Gains	4
Gross Unrealized Losses	(6)
Fair Value	32,832
Cash and Cash Equivalents	12,068
Short-term investments	2,000
Long-term Investments			18,766
State and municipal obligations \| Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	4,454
Gross Unrealized Gains	1
Gross Unrealized Losses	(1)
Fair Value	4,454
Cash and Cash Equivalents	0
Short-term investments	4,454
Long-term Investments			0
Corporate bonds \| Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	127,987
Gross Unrealized Gains	51
Gross Unrealized Losses	(31)
Fair Value	128,007
Cash and Cash Equivalents	2,903
Short-term investments	102,459
Long-term Investments			22,625
U.S. Treasury repurchase agreements \| Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	70,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	70,000
Cash and Cash Equivalents	70,000
Short-term investments	$ 0
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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