The following tables present the Company’s assets that are measured at fair value on a recurring basis: | | | | | | | | | | | | | | | | | | March 31, 2013 | (in thousands) | Quoted Market Prices in Active Markets for Identical Assets (Level 1) | | Significant Other Observable Inputs (Level 2) | | Significant Unobservable Inputs (Level 3) | | Total Fair Value Measurements | Short-term investments: | | | | | | | | U.S. government and agency securities | $ | — |
| | $ | 2,387 |
| | $ | — |
| | $ | 2,387 |
| Corporate obligations | — |
| | 16,674 |
| | — |
| | 16,674 |
| Other fixed income securities | — |
| | 476 |
| | — |
| | 476 |
| International securities | $ | — |
| | 2,465 |
| | $ | — |
| | 2,465 |
| Total | $ | — |
| | $ | 22,002 |
| | $ | — |
| | $ | 22,002 |
|
| | | | | | | | | | | | | | | | | | December 31, 2012 | (in thousands) | Quoted Market Prices in Active Markets for Identical Assets (Level 1) | | Significant Other Observable Inputs (Level 2) | | Significant Unobservable Inputs (Level 3) | | Total Fair Value Measurements | Short-term investments: | | | | | | | | U.S. government and agency securities | $ | — |
| | $ | 3,510 |
| | $ | — |
| | $ | 3,510 |
| Corporate obligations | — |
| | 15,303 |
| | — |
| | 15,303 |
| Other fixed income securities | — |
| | 588 |
| | — |
| | 588 |
| International securities | $ | — |
| | 9,781 |
| | $ | — |
| | 9,781 |
| Total | $ | — |
| | $ | 29,182 |
| | $ | — |
| | $ | 29,182 |
|
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