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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Summary of Financial Instruments Measured at Fair Value on Recurring Basis | The following tables set forth the Company’s financial instruments that were measured at fair value on a recurring basis as of the dates indicated by level within the fair value hierarchy (in thousands):
|  | March 31, 2019 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Unrestricted Balances (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 1,406 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,406 |
Certificates of deposit |  |  | — |  |  |  | 168,903 |  |  |  | — |  |  |  | 168,903 |
Commercial paper |  |  | — |  |  |  | 441,961 |  |  |  | — |  |  |  | 441,961 |
Corporate bonds |  |  | — |  |  |  | 94,507 |  |  |  | — |  |  |  | 94,507 |
Total unrestricted cash equivalents and short-term investments |  |  | 1,406 |  |  |  | 705,371 |  |  |  | — |  |  |  | 706,777 |
Restricted Balances (2)(3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 2,822 |  |  |  | — |  |  |  | — |  |  |  | 2,822 |
Certificates of deposit |  |  | — |  |  |  | 348,369 |  |  |  | — |  |  |  | 348,369 |
Commercial paper |  |  | — |  |  |  | 696,337 |  |  |  | — |  |  |  | 696,337 |
Corporate bonds |  |  | — |  |  |  | 62,254 |  |  |  | — |  |  |  | 62,254 |
Total restricted cash equivalents and investments |  |  | 2,822 |  |  |  | 1,106,960 |  |  |  | — |  |  |  | 1,109,782 |
Total unrestricted and restricted cash equivalents and investments |  | $ | 4,228 |  |  | $ | 1,812,331 |  |  | $ | — |  |  | $ | 1,816,559 |
(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 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.
(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.
|  | December 31, 2018 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Unrestricted Balances (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 38,528 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,528 |
Certificates of deposit |  |  | — |  |  |  | 497,554 |  |  |  | — |  |  |  | 497,554 |
Commercial paper |  |  | — |  |  |  | 1,134,721 |  |  |  | — |  |  |  | 1,134,721 |
Corporate bonds |  |  | — |  |  |  | 119,039 |  |  |  | — |  |  |  | 119,039 |
Total unrestricted cash equivalents and short-term investments |  |  | 38,528 |  |  |  | 1,751,314 |  |  |  | — |  |  |  | 1,789,842 |
Restricted Balances (2)(3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 4,620 |  |  |  | — |  |  |  | — |  |  |  | 4,620 |
Certificates of deposit |  |  | — |  |  |  | 307,604 |  |  |  | — |  |  |  | 307,604 |
Commercial paper |  |  | — |  |  |  | 624,509 |  |  |  | — |  |  |  | 624,509 |
Corporate bonds |  |  | — |  |  |  | 65,586 |  |  |  | — |  |  |  | 65,586 |
Total restricted cash equivalents and investments |  |  | 4,620 |  |  |  | 997,699 |  |  |  | — |  |  |  | 1,002,319 |
Total unrestricted and restricted cash equivalents and investments |  | $ | 43,148 |  |  | $ | 2,749,013 |  |  | $ | — |  |  | $ | 2,792,161 |
(1) | 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.
(2) | 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.
(3) | 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.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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