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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 307,455	$ 338,762
Debt and equity securities, Amortized Cost	306,913	339,145
Debt and equity securities, Unrealized Gains	564	39
Debt and equity securities, Unrealized Losses	(22)	(422)
Debt and equity securities, Estimated Fair Value	307,455	338,762
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	130,372	187,371
Debt securities, Unrealized Gains	329	39
Debt securities, Unrealized Losses	(22)	(344)
Debt securities, Estimated Fair Value	130,679	187,066
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	176,541	151,774
Debt securities, Unrealized Gains	235
Debt securities, Unrealized Losses		(78)
Debt securities, Estimated Fair Value	$ 176,776	$ 151,696

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-Publisher FASB
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-Section 50
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