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Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 37,297	$ 54,131
Gross Unrealized Gain	1	3,952
Gross Unrealized Loss	(20)	(24)
Fair Value	37,278	58,059
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,143	8,991
Fair Value	6,143	8,991
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,142	8,030
Gross Unrealized Gain	1
Gross Unrealized Loss	(14)	(1)
Fair Value	19,129	8,029
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,012	37,110
Gross Unrealized Loss	(6)	(23)
Fair Value	$ 12,006	37,087
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Gain		3,952
Fair Value		$ 3,952

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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