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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash, Cost or Amortized Cost	$ 245,639	$ 387,149
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and Marketable securities, Cost or Amortized Cost	1,208,536		$ 1,279,275
Cash and Marketable securities, Gross Unrealized Gains	254		17
Cash and Marketable securities, Gross Unrealized Losses	(58)		(229)
Cash and Marketable Securities, Total Estimated Fair Value	1,208,732		1,279,063
Fair Value, Measurements, Recurring | Cash
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash, Cost or Amortized Cost	210,507		279,950
Cash, Total Estimated Fair Value	210,507		279,950
Fair Value, Measurements, Recurring | Level 1 Securities | U.S. Government Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	728,749		735,988
Marketable securities, Gross Unrealized Gains	208		12
Marketable securities, Gross Unrealized Losses	(27)		(175)
Marketable securities, Total Estimated Fair Value	728,930		735,825
Fair Value, Measurements, Recurring | Level 1 Securities | U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	167,044		181,032
Marketable securities, Gross Unrealized Gains	15		4
Marketable securities, Gross Unrealized Losses	(31)		(36)
Marketable securities, Total Estimated Fair Value	167,028		181,000
Fair Value, Measurements, Recurring | Level 2 Securities | Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	28,931		35,819
Marketable securities, Gross Unrealized Gains	31		1
Marketable securities, Gross Unrealized Losses			(18)
Marketable securities, Total Estimated Fair Value	28,962		35,802
Fair Value, Measurements, Recurring | Level 2 Securities | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	46,215		33,193
Marketable securities, Total Estimated Fair Value	46,215		33,193
Fair Value, Measurements, Recurring | Level 2 Securities | Certificates of Deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	27,090		13,293
Marketable securities, Total Estimated Fair Value	$ 27,090		$ 13,293

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