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Investments (Tables) | 9 Months Ended
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Sep. 30, 2012
Investments |
Schedule of amortized cost and estimated fair values of available-for-sale securities by investment category |
As of September 30, 2012 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 709 |  | $ | 36 |  | $ | — |  | $ | 745 |
U.S. government securities funds |  | 990 |  | — |  | (4 | ) | 986 |
Equity securities |  | 227 |  | 240 |  | (6 | ) | 461 |
Total short-term investment securities |  | $ | 1,926 |  | $ | 276 |  | $ | (10 | ) | $ | 2,192 |
As of December 31, 2011 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 1,158 |  | $ | 51 |  | $ | — |  | $ | 1,209 |
U.S. government securities funds |  | 988 |  | — |  | (5 | ) | 983 |
Short-term deposits |  | 3,104 |  | — |  | — |  | 3,104 |
Equity securities |  | 227 |  | 159 |  | (5 | ) | 381 |
Total short-term investment securities |  | $ | 5,477 |  | $ | 210 |  | $ | (10 | ) | $ | 5,677 |

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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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