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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 298,373	$ 338,762
Debt and equity securities, Amortized Cost	297,969	339,145
Debt and equity securities, Unrealized Gains	444	39
Debt and equity securities, Unrealized Losses	(40)	(422)
Debt and equity securities, Estimated Fair Value	298,373	338,762
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	108,951	187,371
Debt securities, Unrealized Gains	306	39
Debt securities, Unrealized Losses	(23)	(344)
Debt securities, Estimated Fair Value	109,234	187,066
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	189,018	151,774
Debt securities, Unrealized Gains	138
Debt securities, Unrealized Losses	(17)	(78)
Debt securities, Estimated Fair Value	$ 189,139	$ 151,696

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