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Marketable Securities and Investments (Tables) | 12 Months Ended
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May 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Marketable securities | As of May 31, 2014, marketable securities consisted of the following:
| Amortized cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (in thousands)
Available-for-sales securities |  |  |  |  |  |  |
U.S. government agency obligations | $ | 1,825 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 1,809 |
Corporate bond securities | — |  |  | — |  |  | — |  |  | — |
| $ | 1,825 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 1,809 |
As of May 31, 2013, marketable securities consisted of the following:
| Amortized cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (in thousands)
Available-for-sales securities |  |  |  |  |  |  |
U.S. government agency obligations | $ | 1,850 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,850 |
Corporate bond securities | 303 |  |  | — |  |  | — |  |  | 303 |
| $ | 2,153 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,153 |
Amortized cost and fair value of marketable securities by contractual maturity | The amortized cost and fair value of marketable securities as of May 31, 2014, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
| Amortized cost |  | Fair Value
| (in thousands)
As of May 31, 2014: |  |  |
Due in one year or less | $ | — |  |  | $ | — |
Due after one through five years | — |  |  | — |
Due after five through twenty years | 1,825 |  |  | 1,809 |
| $ | 1,825 |  |  | $ | 1,809 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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