Summary of Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 196,113	$ 122,651
Unrealized Gains	78	11
Unrealized Losses	(66)	(10)
Estimated Fair Value	196,125	122,652
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	44,806	49,511
Unrealized Gains	7
Unrealized Losses	(1)
Estimated Fair Value	44,812	49,511
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	151,307	73,140
Unrealized Gains	71	11
Unrealized Losses	(65)	(10)
Estimated Fair Value	151,313	73,141
Cash \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	4,561	2,522
Estimated Fair Value	4,561	2,522
Money Market Funds \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	21,193	46,989
Estimated Fair Value	21,193	46,989
Corporate Debt Securities \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	19,052
Unrealized Gains	7
Unrealized Losses	(1)
Estimated Fair Value	19,058
Corporate Debt Securities \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	133,679
Unrealized Gains	71
Unrealized Losses	(59)
Estimated Fair Value	133,691
U.S. Government Agency Securities \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	17,628	73,140
Unrealized Gains		11
Unrealized Losses	(6)	(10)
Estimated Fair Value	$ 17,622	$ 73,141

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- Definition

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
-Section 25
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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