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Investments (Tables) | 6 Months Ended
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Mar. 31, 2016
Summary of Investments by Type of Security | The following table summarizes investments by type of security as of March 31, 2016:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Market Value |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities, short-term |  | $ | 10,479 |  |  | $ | 2 |  |  | $ | (1 | ) |  | $ | 10,480 |
Corporate debt securities, long-term |  |  | 753 |  |  |  | - |  |  |  | (3 | ) |  |  | 750 |
Government debt securities, short-term |  |  | 4,458 |  |  |  | - |  |  |  | (3 | ) |  |  | 4,455 |
Government debt securities, long-term |  |  | 3,003 |  |  |  | 1 |  |  |  | (1 | ) |  |  | 3,003 |
Total |  | $ | 18,693 |  |  | $ | 3 |  |  | $ | (8 | ) |  | $ | 18,688 |
The following table summarizes investments by type of security as of September 30, 2015:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Market Value |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities, short-term |  | $ | 23,924 |  |  | $ | 3 |  |  | $ | (6 | ) |  | $ | 23,921 |
Corporate debt securities, long-term |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 23,924 |  |  | $ | 3 |  |  | $ | (6 | ) |  | $ | 23,921 |
Summary of Fair Value of Investments Measured on Recurring Basis | The following table represents the fair value hierarchy of the Company’s investments and acquisition related contingent consideration:
|  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
March 31, 2016: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |  |
Industrial |  | $ | 5,478 |  |  | $ | - |
Financial |  |  | 2,805 |  |  |  | - |
Commercial paper |  |  |  |  |  |  |  |
Financial |  |  | 1,497 |  |  |  | - |
Industrial |  |  | 700 |  |  |  | - |
Government debt securities |  |  |  |  |  |  |  |
U.S. Treasury |  |  | 4,455 |  |  |  | - |
Long-term investments: |  |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |  |
Industrial |  |  | 750 |  |  |  | - |
Government debt securities |  |  |  |  |  |  |  |
U.S. Treasury |  |  | 3,003 |  |  |  | - |
Total assets at fair value |  | $ | 18,688 |  |  | $ | - |
Liabilities: |  |  |  |  |  |  |  |
Acquisition-related contingent consideration |  |  | - |  |  |  | 221 |
Total liabilities at fair value |  | $ | - |  |  | $ | 221 |
|  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
September 30, 2015: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |  |
Financial |  | $ | 10,308 |  |  | $ | - |
Industrial |  |  | 9,665 |  |  |  | - |
Utility |  |  | 1,802 |  |  |  | - |
Commercial paper |  |  |  |  |  |  |  |
Industrial |  |  | 1,448 |  |  |  | - |
Financial |  |  | 698 |  |  |  | - |
Total assets at fair value |  | $ | 23,921 |  |  | $ | - |
Liabilities: |  |  |  |  |  |  |  |
Acquisition-related contingent consideration |  |  | - |  |  |  | 47 |
Total liabilities at fair value |  | $ | - |  |  | $ | 47 |
Contingent Consideration |
Summary of Contingent Consideration Measured at Fair Value | The following table includes a summary of the contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the six months ended March 31, 2016:
Balance at September 30, 2015 | $ | 47 |
Expenses recorded due to changes in fair value |  | 174 |
Payments |  | - |
Balance at March 31, 2016 | $ | 221 |

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