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Investments (Tables) | 6 Months Ended
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Jun. 30, 2013
Investments |
Schedule of amortized cost and estimated fair values of available-for-sale securities by balance sheet classification |
As of June 30, 2013 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 505 |  | $ | 19 |  | $ | — |  | $ | 524 |
U.S. government securities funds |  | 995 |  | — |  | (14 | ) | 981 |
Equity securities |  | 227 |  | 288 |  | (2 | ) | 513 |
Total short-term investment securities |  | $ | 1,727 |  | $ | 307 |  | $ | (16 | ) | $ | 2,018 |
As of December 31, 2012 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 608 |  | $ | 30 |  | $ | — |  | $ | 638 |
U.S. government securities funds |  | 995 |  | — |  | (9 | ) | 986 |
Equity securities |  | 227 |  | 228 |  | (8 | ) | 447 |
Total short-term investment securities |  | $ | 1,830 |  | $ | 258 |  | $ | (17 | ) | $ | 2,071 |

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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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