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Investments (Tables) | 9 Months Ended
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Sep. 30, 2014
Investments |
Schedule of amortized cost and estimated fair values of available-for-sale securities by balance sheet classification |
As of September 30, 2014 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 201 |  | $ | 1 |  | $ | — |  | $ | 202 |
U.S. government securities funds |  | 1,000 |  | — |  | (12 | ) | 988 |
Equity securities |  | 227 |  | 412 |  | (9 | ) | 630 |
Total short-term investment securities |  | $ | 1,428 |  | $ | 413 |  | $ | (21 | ) | $ | 1,820 |
As of December 31, 2013 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 403 |  | $ | 12 |  | $ | — |  | $ | 415 |
U.S. government securities funds |  | 997 |  | — |  | (14 | ) | 983 |
Equity securities |  | 227 |  | 386 |  | (5 | ) | 608 |
Total short-term investment securities |  | $ | 1,627 |  | $ | 398 |  | $ | (19 | ) | $ | 2,006 |

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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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