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Available-for-Sale-Securities (Tables) | 9 Months Ended
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Sep. 30, 2017
Available-for-sale Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):
| September 30, 2017 |  | December 31, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Certificate of deposits | $ | 249.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 249.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Corporate debt securities | 49,345.6 |  |  | — |  |  | (28.8 | ) |  | 49,316.8 |  |  | — |  |  | — |  |  | — |  |  | — |
Money market funds | 6,678.6 |  |  | 0.1 |  |  | — |  |  | 6,678.7 |  |  | 4,426.8 |  |  | — |  |  | — |  |  | 4,426.8 |
Total | $ | 56,273.2 |  |  | $ | 0.1 |  |  | $ | (28.8 | ) |  | $ | 56,244.5 |  |  | $ | 4,426.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,426.8 |
Schedule of Marketable Securities | Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale debt securities on our Consolidated Balance Sheets (in thousands):
| September 30, 2017 |  | December 31, 2016
Cash and cash equivalents | $ | 11,872.9 |  |  | $ | 4,426.8 |
Marketable securities | 44,371.6 |  |  | — |
Total | $ | 56,244.5 |  |  | $ | 4,426.8 |
Investments Classified by Contractual Maturity Date | The following table summarizes our portfolio of available-for-sale debt securities by contractual maturity (in thousands):
| September 30, 2017
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 56,273.2 |  |  | $ | 56,244.5 |
Greater than one year | — |  |  | — |
Total | $ | 56,273.2 |  |  | $ | 56,244.5 |

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