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Investments (Tables) | 9 Months Ended
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Sep. 30, 2015
Investments |
Schedule of amortized cost and estimated fair values of available-for-sale securities by balance sheet classification |
As of September 30, 2015 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
U.S. government securities funds |  | $ | 1,791 |  | $ | — |  | $ | (5 | ) | $ | 1,786 |
Total short-term investment securities |  | $ | 1,791 |  | $ | — |  | $ | (5 | ) | $ | 1,786 |
As of December 31, 2014 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 100 |  | $ | 1 |  | $ | — |  | $ | 101 |
U.S. government securities funds |  | 1,791 |  | — |  | (15 | ) | 1,776 |
Equity securities |  | 227 |  | 454 |  | (12 | ) | 669 |
Total short-term investment securities |  | $ | 2,118 |  | $ | 455 |  | $ | (27 | ) | $ | 2,546 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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