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Cash Equivalents and Investments - Schedule of Securities Classified as Cash, Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	$ 67,745	$ 75,383	[1]	$ 71,213	$ 74,598
Cash and cash equivalents, at Carrying Value	67,747
Cash and cash equivalents, Gross Unrealized Losses	(2)
Cash and cash equivalents, Fair Value	67,745	75,383
Short-term investments, Amortized Cost	59,793	58,640
Short-term investments, Gross Unrealized Losses	(89)	(47)
Short-term investments, Fair Value	59,704	58,593
Cash equivalents and short-term investments, Amortized Cost	127,540	134,023
Cash equivalents and short-term investments, Gross Unrealized Losses	(91)	(47)
Cash equivalents and short-term investments, Fair Value	127,449	133,976
Cash [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	5,506	5,882
Cash and cash equivalents, Fair Value	5,506	5,882
Money Market Funds [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	57,491	68,651
Cash and cash equivalents, Fair Value	57,491	68,651
U.S. Treasury Securities [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	1,000
Cash and cash equivalents, Fair Value	1,000
Corporate Bonds [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	2,550
Cash and cash equivalents, Gross Unrealized Losses	(2)
Cash and cash equivalents, Fair Value	2,548
Commercial Paper (Cash Equivalents) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	1,200	850
Cash and cash equivalents, Fair Value	1,200	850
U.S. Treasury Securities [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost		3,994
Short-term investments, Gross Unrealized Losses		(1)
Short-term investments, Fair Value		3,993
Corporate Bonds [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	27,332	26,853
Short-term investments, Gross Unrealized Losses	(60)	(26)
Short-term investments, Fair Value	27,272	26,827
Commercial Paper (Investments) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	28,512	19,584
Short-term investments, Gross Unrealized Losses	(19)	(14)
Short-term investments, Fair Value	28,493	19,570
Asset-Backed Securities [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	3,949	8,209
Short-term investments, Gross Unrealized Losses	(10)	(6)
Short-term investments, Fair Value	$ 3,939	$ 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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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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