Cash, Cash Equivalents, and Investments - Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 336,349	$ 349,462
Gross Unrealized Gains	44	0
Gross Unrealized Losses	(5)	0
Fair Value	336,388	349,462
Cash and Cash Equivalents	219,720	349,462
Short-term investments	116,629	0
Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	118,627
Gross Unrealized Gains	44
Gross Unrealized Losses	(5)
Fair Value	118,666
Cash and Cash Equivalents	1,998
Short-term investments	116,629
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	129,347	144,095
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	129,347	144,095
Cash and Cash Equivalents	129,347	144,095
Short-term investments	0	0
Money market funds \| Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	88,375	205,367
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	88,375	205,367
Cash and Cash Equivalents	88,375	205,367
Short-term investments	$ 0	$ 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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- Definition

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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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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