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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2021
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, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Unrestricted Balances(1) |  |  |  |  |  |  |
Money market funds | $ | 88,630 |  |  | $ | — |  |  | $ | — |  |  | $ | 88,630 |
Certificates of deposit | — |  |  | 864,598 |  |  | — |  |  | 864,598 |
Commercial paper | — |  |  | 312,873 |  |  | — |  |  | 312,873 |
Corporate bonds | — |  |  | 107,620 |  |  | — |  |  | 107,620 |
Total unrestricted cash equivalents and investments | 88,630 |  |  | 1,285,091 |  |  | — |  |  | 1,373,721 |
Restricted Balances(2) |  |  |  |  |  |  |
Money market funds | 126,649 |  |  | — |  |  | — |  |  | 126,649 |
Certificates of deposit | — |  |  | 606,331 |  |  | — |  |  | 606,331 |
Commercial paper | — |  |  | 258,637 |  |  | — |  |  | 258,637 |
Corporate bonds | — |  |  | 68,941 |  |  | — |  |  | 68,941 |
Total restricted cash equivalents and investments | 126,649 |  |  | 933,909 |  |  | — |  |  | 1,060,558 |
Total unrestricted and restricted cash equivalents and investments | $ | 215,279 |  |  | $ | 2,219,000 |  |  | $ | — |  |  | $ | 2,434,279 |
_______________ (1)$44.2 million of cash, $180.0 million of money market deposit accounts and $640.0 million of term deposits are not subject to recurring fair value measurement and therefore excluded from this table. However, these balances are included within the $2.2 billion of cash and cash equivalents and short-term investments on the condensed consolidated balance sheets. (2)$57.0 million of restricted cash and $6.5 million of a restricted term deposit are not subject to recurring fair value measurement and therefore excluded from this table. However, these balances are included within the $1.1 billion of restricted cash and cash equivalents and restricted short-term investments on the condensed consolidated balance sheets.
| December 31, 2020
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Unrestricted Balances(1) |  |  |  |  |  |  |
Certificates of deposit | $ | — |  |  | $ | 677,777 |  |  | $ | — |  |  | $ | 677,777 |
Commercial paper | — |  |  | 376,789 |  |  | — |  |  | 376,789 |
Corporate bonds | — |  |  | 287,519 |  |  | — |  |  | 287,519 |
Total unrestricted cash equivalents and short-term investments | — |  |  | 1,342,085 |  |  | — |  |  | 1,342,085 |
Restricted Balances(2) |  |  |  |  |  |  |
Money market funds | 24,757 |  |  | — |  |  | — |  |  | 24,757 |
Certificates of deposit | — |  |  | 481,365 |  |  | — |  |  | 481,365 |
Commercial paper | — |  |  | 469,240 |  |  | — |  |  | 469,240 |
Corporate bonds | — |  |  | 184,601 |  |  | — |  |  | 184,601 |
Total restricted cash equivalents and investments | 24,757 |  |  | 1,135,206 |  |  | — |  |  | 1,159,963 |
Total unrestricted and restricted cash equivalents and investments | $ | 24,757 |  |  | $ | 2,477,291 |  |  | $ | — |  |  | $ | 2,502,048 |
_______________ (1)$133.6 million of cash, $174.3 million of money market deposit accounts and $601.0 million of term deposits are not subject to recurring fair value measurement and therefore excluded from this table. However, these balances are included within the $2.3 billion of cash and cash equivalents and short-term investments on the condensed consolidated balance sheets. (2)$53.8 million of restricted cash, $0.2 million of a money market deposit account and $6.5 million of a restricted term deposit are not subject to recurring fair value measurement and therefore excluded from this table. However, these balances are included within the $1.2 billion of restricted cash and cash equivalents and restricted short-term investments on the condensed consolidated balance sheets.

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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=117815213&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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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