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Fair Value of Financial Instruments - Summary of Composition of Short and Long Term Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 350,892	$ 90,570
Unrealized Gains	28
Unrealized Losses	(121)	(204)
Aggregate Fair Value	350,799	90,366
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,770	12,446
Unrealized Losses	(3)	(7)
Aggregate Fair Value	4,767	12,439
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77,460	67,126
Unrealized Gains	2
Unrealized Losses	(103)	(179)
Aggregate Fair Value	77,359	66,947
US Government Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,999	10,998
Unrealized Losses	(9)	(18)
Aggregate Fair Value	8,990	$ 10,980
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	259,663
Unrealized Gains	26
Unrealized Losses	(6)
Aggregate Fair Value	$ 259,683

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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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