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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
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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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