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Summary of Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 93,381	$ 122,651
Unrealized Gains	7	11
Unrealized Losses	(7)	(10)
Estimated Fair Value	93,381	122,652
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	36,486	49,511
Estimated Fair Value	36,486	49,511
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	56,895	73,140
Unrealized Gains	7	11
Unrealized Losses	(7)	(10)
Estimated Fair Value	56,895	73,141
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	5,639	2,522
Estimated Fair Value	5,639	2,522
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	30,847	46,989
Estimated Fair Value	30,847	46,989
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	56,895	73,140
Unrealized Gains	7	11
Unrealized Losses	(7)	(10)
Estimated Fair Value	$ 56,895	$ 73,141

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

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