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Available-for-Sale-Securities | 12 Months Ended
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Dec. 31, 2017
Available-for-sale Securities [Abstract] |
Available-for-Sale-Securities | Available-for-Sale-Securities The following table is a summary of available-for-sale securities recorded in cash and cash equivalents in our Consolidated Balance Sheets (in thousands):
| December 31, 2017 |  | December 31, 2016
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate debt securities | $ | 42,701.0 |  |  | $ | — |  |  | $ | (28.0 | ) |  | $ | 42,673.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Money market funds | 9,211.5 |  |  | — |  |  | — |  |  | 9,211.5 |  |  | 4,426.8 |  |  | — |  |  | — |  |  | 4,426.8 |
Total | $ | 51,912.5 |  |  | $ | — |  |  | $ | (28.0 | ) |  | $ | 51,884.5 |  |  | $ | 4,426.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,426.8 |
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):
| December 31, 2017 |  | December 31, 2016
Cash and cash equivalents | $ | 25,967.8 |  |  | $ | 4,426.8 |
Marketable securities | 25,916.7 |  |  | — |
Total | $ | 51,884.5 |  |  | $ | 4,426.8 |
The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
| December 31, 2017
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 51,912.5 |  |  | $ | 51,884.5 |
Greater than one year | — |  |  | — |
Total | $ | 51,912.5 |  |  | $ | 51,884.5 |

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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