Fair Value Measurements and Fair Value of Financial Instruments - Summary of Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	$ 79,531	$ 120,148
Unrealized Gains		1
Unrealized Loses	(106)	(183)
Estimated Fair Value	79,425	119,966
Less: Cash Equivalents, Amortized Cost Basis	(148,900)	(57,780)
Less: Cash Equivalents, Unrealized Gains	0	0
Less: Cash Equivalents, Unrealized Loses	0	0
Less: Cash Equivalents, Estimated Fair Value	(148,900)	(57,780)
Money Market Funds [Member] \| Quoted Prices in Active Markets (Level 1) [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	56	65
Estimated Fair Value	56	65
Certificates of Deposit [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	6,120	9,731
Estimated Fair Value	6,120	9,731
Commercial Paper [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	176,101	71,427
Estimated Fair Value	176,101	71,427
U.S. Government Agency Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	24,606	58,351
Unrealized Loses	(86)	(145)
Estimated Fair Value	24,520	58,206
Corporate Bonds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	21,548	38,354
Unrealized Gains		1
Unrealized Loses	(20)	(38)
Estimated Fair Value	21,528	38,317
Total Cash Equivalents and Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	228,431	177,928
Unrealized Gains		1
Unrealized Loses	(106)	(183)
Estimated Fair Value	$ 228,325	$ 177,746

Cash and cash equivalent amortized cost.

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Cash and cash equivalent gross unrealized gain.

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Cash and cash equivalent gross unrealized loss.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Fair value portion 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.

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Amount of investment in marketable security, classified as current.

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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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