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Supplemental Financial Statement Information - Summary of Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Cash Equivalents and Short-Term Investments [Line Items] |  |  |  |  |
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost |  | $ 706,324 | [1] | $ 1,790,411 | [2]
Unrestricted cash equivalents and short-term investments, Unrealized Gains |  | 486 | [1] | 76 | [2]
Unrestricted cash equivalents and short-term investments, Unrealized Losses |  | (33) | [1] | (645) | [2]
Unrestricted cash equivalents and short-term investments, Estimated Fair Value |  | 706,777 | [1] | 1,789,842 | [2]
Restricted cash equivalents and investments, Cost or Amortized Cost |  | 1,109,284 | [3],[4] | 1,002,605 | [5],[6]
Restricted cash equivalents and investments, Unrealized Gains |  | 598 | [3],[4] | 64 | [5],[6]
Restricted cash equivalents and investments, Unrealized Losses |  | (100) | [3],[4] | (350) | [5],[6]
Restricted cash equivalents and investments, Estimated Fair Value |  | 1,109,782 | [3],[4] | 1,002,319 | [5],[6]
Unrestricted and restricted cash equivalents and investments, Cost or Amortized Cost |  | 1,815,608 |  | 2,793,016 |
Unrestricted and restricted cash equivalents and investments, Unrealized Gains |  | 1,084 |  | 140 |
Unrestricted and restricted cash equivalents and investments, Unrealized Losses |  | (133) |  | (995) |
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value |  | 1,816,559 |  | 2,792,161 |
Corporate Bonds |  |  |  |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |  |  |  |
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost |  | 94,415 | [1] | 119,043 | [2]
Unrestricted cash equivalents and short-term investments, Unrealized Gains |  | 93 | [1] | 19 | [2]
Unrestricted cash equivalents and short-term investments, Unrealized Losses |  | (1) | [1] | (23) | [2]
Unrestricted cash equivalents and short-term investments, Estimated Fair Value |  | 94,507 | [1] | 119,039 | [2]
Restricted cash equivalents and investments, Cost or Amortized Cost |  | 62,204 | [3],[4] | 65,616 | [5],[6]
Restricted cash equivalents and investments, Unrealized Gains |  | 58 | [3],[4] | 6 | [5],[6]
Restricted cash equivalents and investments, Unrealized Losses |  | (8) | [3],[4] | (36) | [5],[6]
Restricted cash equivalents and investments, Estimated Fair Value |  | 62,254 | [3],[4] | 65,586 | [5],[6]
Money Market Funds |  |  |  |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |  |  |  |
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost |  | 1,406 | [1] | 38,528 | [2]
Unrestricted cash equivalents and short-term investments, Estimated Fair Value |  | 1,406 | [1] | 38,528 | [2]
Restricted cash equivalents and investments, Cost or Amortized Cost |  | 2,822 | [3],[4] | 4,620 | [5],[6]
Restricted cash equivalents and investments, Estimated Fair Value |  | 2,822 | [3],[4] | 4,620 | [5],[6]
Certificates of Deposit |  |  |  |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |  |  |  |
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost |  | 168,700 | [1] | 497,748 | [2]
Unrestricted cash equivalents and short-term investments, Unrealized Gains |  | 203 | [1] | 19 | [2]
Unrestricted cash equivalents and short-term investments, Unrealized Losses | [2] |  |  | (213) |
Unrestricted cash equivalents and short-term investments, Estimated Fair Value |  | 168,903 | [1] | 497,554 | [2]
Restricted cash equivalents and investments, Cost or Amortized Cost |  | 348,007 | [3],[4] | 307,650 | [5],[6]
Restricted cash equivalents and investments, Unrealized Gains |  | 364 | [3],[4] | 41 | [5],[6]
Restricted cash equivalents and investments, Unrealized Losses |  | (2) | [3],[4] | (87) | [5],[6]
Restricted cash equivalents and investments, Estimated Fair Value |  | 348,369 | [3],[4] | 307,604 | [5],[6]
Commercial Paper |  |  |  |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |  |  |  |
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost |  | 441,803 | [1] | 1,135,092 | [2]
Unrestricted cash equivalents and short-term investments, Unrealized Gains |  | 190 | [1] | 38 | [2]
Unrestricted cash equivalents and short-term investments, Unrealized Losses |  | (32) | [1] | (409) | [2]
Unrestricted cash equivalents and short-term investments, Estimated Fair Value |  | 441,961 | [1] | 1,134,721 | [2]
Restricted cash equivalents and investments, Cost or Amortized Cost |  | 696,251 | [3],[4] | 624,719 | [5],[6]
Restricted cash equivalents and investments, Unrealized Gains |  | 176 | [3],[4] | 17 | [5],[6]
Restricted cash equivalents and investments, Unrealized Losses |  | (90) | [3],[4] | (227) | [5],[6]
Restricted cash equivalents and investments, Estimated Fair Value |  | $ 696,337 | [3],[4] | $ 624,509 | [5],[6]
[1] | Included in cash and cash equivalents and short-term investments in the Company’s condensed consolidated balance sheet as of March 31, 2019 in addition to $328.1 million of cash.
[2] | Included in cash and cash equivalents and short-term investments in the Company’s condensed consolidated balance sheet as of December 31, 2018 in addition to $248.0 million of cash.
[3] | Included in prepaid expenses and other current assets in the Company’s condensed consolidated balance sheet as of March 31, 2019 is $1.9 million of restricted cash.
[4] | Included in restricted cash and cash equivalents and restricted investments in the Company’s condensed consolidated balance sheet as of March 31, 2019 in addition to $58.0 million of restricted cash.
[5] | Included in prepaid expenses and other current assets in the Company’s condensed consolidated balance sheet as of December 31, 2018 is $1.4 million of restricted cash.
[6] | Included in restricted cash and cash equivalents and restricted investments in the Company’s condensed consolidated balance sheet as of December 31, 2018 in addition to $50.2 million of restricted cash.

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