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Cash and Cash Equivalents, Short-term Investments and Restricted Cash | 9 Months Ended
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Sep. 30, 2020
Cash and Cash Equivalents [Abstract] |
Cash and Cash Equivalents, Short-term Investments and Restricted Cash | Cash and Cash Equivalents, Short-term Investments and Restricted Cash The following tables present the amortized cost, gross unrealized gains and losses and estimated fair market value of our cash and cash equivalents, available-for-sale investments and restricted cash as of the dates presented (in thousands):
| September 30, 2020
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 150,556 |  |  | $ | — |  |  | $ | — |  |  | $ | 150,556 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 1,747,818 |  |  | — |  |  | — |  |  | 1,747,818 |
Treasury bills | 5,000 |  |  | — |  |  | — |  |  | 5,000 |
U.S. government agency securities | 1,162 |  |  | — |  |  | — |  |  | 1,162 |
Certificates of deposit | 249 |  |  | — |  |  | — |  |  | 249 |
Short-term investments: |  |  |  |  |  |  |
Treasury bills | 1,360,011 |  |  | 76 |  |  | (3) |  |  | 1,360,084 |
U.S. government agency securities | 499,494 |  |  | 514 |  |  | (17) |  |  | 499,991 |
Corporate notes and bonds | 15,611 |  |  | 24 |  |  | — |  |  | 15,635 |
Municipal securities | 8,676 |  |  | 3 |  |  | — |  |  | 8,679 |
Certificates of deposit | 996 |  |  | — |  |  | — |  |  | 996 |
Restricted cash | 44,103 |  |  | — |  |  | — |  |  | 44,103 |
Total | $ | 3,833,676 |  |  | $ | 617 |  |  | $ | (20) |  |  | $ | 3,834,273 |
| December 31, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 194,955 |  |  | $ | — |  |  | $ | — |  |  | $ | 194,955 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 872,431 |  |  | — |  |  | — |  |  | 872,431 |
U.S. government agency securities | 35,011 |  |  | — |  |  | (2) |  |  | 35,009 |
Commercial paper | 31,113 |  |  | — |  |  | — |  |  | 31,113 |
Treasury bills | 6,441 |  |  | — |  |  | — |  |  | 6,441 |
Corporate notes and bonds | 1,065 |  |  | — |  |  | — |  |  | 1,065 |
Certificates of deposit | 249 |  |  | — |  |  | — |  |  | 249 |
Short-term investments: |  |  |  |  |  |  |
U.S. government agency securities | 861,862 |  |  | 365 |  |  | (73) |  |  | 862,154 |
Corporate notes and bonds | 159,382 |  |  | 91 |  |  | (42) |  |  | 159,431 |
Commercial paper | 150,267 |  |  | — |  |  | — |  |  | 150,267 |
Treasury bills | 79,989 |  |  | 14 |  |  | — |  |  | 80,003 |
Municipal securities | 27,836 |  |  | 56 |  |  | (3) |  |  | 27,889 |
Certificates of deposit | 1,245 |  |  | — |  |  | — |  |  | 1,245 |
Restricted cash | 89,646 |  |  | — |  |  | — |  |  | 89,646 |
Total | $ | 2,511,492 |  |  | $ | 526 |  |  | $ | (120) |  |  | $ | 2,511,898 |
All available-for-sale investments as of September 30, 2020 have a contractual maturity date of one year or less.

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- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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