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Cash, Cash Equivalents and Investments - Schedule of Securities Classified as Cash, Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017		Sep. 30, 2017	Dec. 31, 2016
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	$ 75,015	$ 75,383	[1]	$ 59,454	$ 74,598
Cash and cash equivalents, Fair Value	75,015	75,383
Short-term investments, Amortized Cost	111,408	58,640
Short-term investments, Gross Unrealized Losses	(17)	(47)
Short-term investments, Fair Value	111,391	58,593
Cash equivalents and short-term investments, Amortized Cost	186,423	134,023
Cash equivalents and short-term investments, Gross Unrealized Losses	(17)	(47)
Cash equivalents and short-term investments, Fair Value	186,406	133,976
Cash [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	2,787	5,882
Cash and cash equivalents, Fair Value	2,787	5,882
Money Market Funds [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	66,235	68,651
Cash and cash equivalents, Fair Value	66,235	68,651
Corporate Bonds (Investments) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	1,999
Cash and cash equivalents, Fair Value	1,999
Commercial Paper (Cash Equivalents) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	3,994	850
Cash and cash equivalents, Fair Value	3,994	850
U.S. Treasury Securities [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	7,959	3,994
Short-term investments, Gross Unrealized Losses	(2)	(1)
Short-term investments, Fair Value	7,957	3,993
Corporate Bonds (Investments) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	34,449	26,853
Short-term investments, Gross Unrealized Losses	(9)	(26)
Short-term investments, Fair Value	34,440	26,827
Commercial Paper (Investments) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	61,116	19,584
Short-term investments, Gross Unrealized Losses	(5)	(14)
Short-term investments, Fair Value	61,111	19,570
Asset-Backed Securities [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	7,884	8,209
Short-term investments, Gross Unrealized Losses	(1)	(6)
Short-term investments, Fair Value	$ 7,883	$ 8,203
[1] Derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10K for the year ended December 31, 2017.

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Cash, cash equivalents and short term investments fair value disclosure.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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

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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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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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