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Marketable Securities - Schedule of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	$ 34,287	$ 6,030	$ 11,205	$ 10,186
Total cash equivalents	12,747	3,182
Amortized Cost	197,735	223,399
Gross Unrealized Gains	54	33
Gross Unrealized (Losses)		(58)
Estimated Fair Value	197,789	223,374
Available-for-sale securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	184,988	220,217
Gross Unrealized Gains	54	33
Gross Unrealized (Losses)		(58)
Estimated Fair Value	185,042	220,192
Money market funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	12,747	3,182
Total cash equivalents	12,747	3,182
Cash equivalents [Member]
Schedule Of Available For Sale Securities [Line Items]
Cash and cash equivalents	12,747	3,182
Total cash equivalents	12,747	3,182
Commercial paper securities [Member] | Available-for-sale securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	15,371	33,715
Gross Unrealized Gains	28	33
Estimated Fair Value	15,399	33,748
Corporate debt securities [Member] | Available-for-sale securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	29,215	22,831
Gross Unrealized Gains	2
Gross Unrealized (Losses)		(18)
Estimated Fair Value	29,217	22,813
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	140,402	163,671
Gross Unrealized Gains	24
Gross Unrealized (Losses)		(40)
Estimated Fair Value	$ 140,426	$ 163,631

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