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Cash, Cash Equivalents and Investments - Schedule of Securities Classified as Cash and Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	$ 74,598	$ 107,004	$ 107,286	$ 34,435
Cash and cash equivalents, Gross Unrealized Gains	0	0
Cash and cash equivalents, Gross Unrealized Losses	0	0
Cash and cash equivalents, Fair Value	74,598	107,004
Short-term investments, Amortized Cost	126,296
Short-term investments, Gross Unrealized Gains	7
Short-term investments, Gross Unrealized Losses	(78)
Short-term investments, Fair Value	126,225
Cash equivalents and short-term investments, Amortized Cost	200,894
Cash equivalents and short-term investments, Gross Unrealized Gains	7
Cash equivalents and short-term investments, Gross Unrealized Losses	(78)
Cash equivalents and short-term investments, Fair Value	200,823
Cash [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	3,638	25,194
Cash and cash equivalents, Gross Unrealized Gains	0	0
Cash and cash equivalents, Gross Unrealized Losses	0	0
Cash and cash equivalents, Fair Value	3,638	25,194
Money Market Funds [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	68,561	81,810
Cash and cash equivalents, Gross Unrealized Gains	0	0
Cash and cash equivalents, Gross Unrealized Losses	0	0
Cash and cash equivalents, Fair Value	68,561	$ 81,810
Commercial Paper (Cash Equivalents) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Cash and cash equivalents, Amortized Cost	2,399
Cash and cash equivalents, Gross Unrealized Gains	0
Cash and cash equivalents, Gross Unrealized Losses	0
Cash and cash equivalents, Fair Value	2,399
Corporate Bonds (Investments) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	58,464
Short-term investments, Gross Unrealized Gains	2
Short-term investments, Gross Unrealized Losses	(56)
Short-term investments, Fair Value	58,410
Commercial Paper (Investments) [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	62,946
Short-term investments, Gross Unrealized Gains	5
Short-term investments, Gross Unrealized Losses	(20)
Short-term investments, Fair Value	62,931
Asset-Backed Securities [Member]
Cash Cash Equivalents And Short Term Investments [Line Items]
Short-term investments, Amortized Cost	4,886
Short-term investments, Gross Unrealized Losses	(2)
Short-term investments, Fair Value	$ 4,884

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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 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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