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Summary of Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 109,532	$ 196,113
Unrealized Gains	34	78
Unrealized Losses	(15)	(66)
Estimated Fair Value	109,551	196,125
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	23,021	44,806
Unrealized Gains		7
Unrealized Losses		(1)
Estimated Fair Value	23,021	44,812
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	86,511	151,307
Unrealized Gains	34	71
Unrealized Losses	(15)	(65)
Estimated Fair Value	86,530	151,313
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	2,384	4,561
Estimated Fair Value	2,384	4,561
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	19,637	21,193
Estimated Fair Value	19,637	21,193
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,000	19,052
Unrealized Gains		7
Unrealized Losses		(1)
Estimated Fair Value	1,000	19,058
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	31,144	133,679
Unrealized Gains	5	71
Unrealized Losses	(15)	(59)
Estimated Fair Value	31,134	133,691
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	6,522
Unrealized Gains	4
Estimated Fair Value	6,526
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	48,845	17,628
Unrealized Gains	25
Unrealized Losses		(6)
Estimated Fair Value	$ 48,870	$ 17,622

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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