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Fair Value of Financial Instruments - Summary of Composition of Short and Long Term Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 404,291	$ 448,492
Unrealized Gains		8
Unrealized Losses	(812)	(443)
Aggregate Fair Value	403,479	448,057
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,891	5,874
Unrealized Losses	(6)	(7)
Aggregate Fair Value	4,885	5,867
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	83,648	81,947
Unrealized Losses	(489)	(279)
Aggregate Fair Value	83,159	81,668
US Government Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,000	4,000
Unrealized Losses	(9)	(13)
Aggregate Fair Value	2,991	3,987
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	312,752	356,671
Unrealized Gains		8
Unrealized Losses	(308)	(144)
Aggregate Fair Value	$ 312,444	$ 356,535

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- Definition

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

+ References

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-Publisher FASB
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