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Investments (Tables) | 12 Months Ended
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Sep. 30, 2016
Summary of Investments by Type of Security | The following table summarizes investments by security type as of September 30, 2016 and 2015 (amounts shown in thousands):
|  | September 30, 2016 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Market Value |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury |  | $ | 12,907 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 12,915 |
Corporate debt securities, short-term |  |  | 11,949 |  |  |  | 2 |  |  |  | (3 | ) |  |  | 11,948 |
Corporate debt securities, long-term |  |  | 1,954 |  |  |  | 1 |  |  |  | (3 | ) |  |  | 1,952 |
Total |  | $ | 26,810 |  |  | $ | 11 |  |  | $ | (6 | ) |  | $ | 26,815 |
|  | 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 |
Total |  | $ | 23,924 |  |  | $ | 3 |  |  | $ | (6 | ) |  | $ | 23,921 |
Summary of Fair Value of Investments Measured on Recurring Basis |
|  | Balance |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
September 30, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury |  | $ | 12,915 |  |  | $ | 12,915 |  |  | $ | — |  |  | $ | — |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial |  |  | 3,963 |  |  |  | — |  |  |  | 3,963 |  |  |  | — |
Industrial |  |  | 4,445 |  |  |  | — |  |  |  | 4,445 |  |  |  | — |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Industrial |  |  | 697 |  |  |  | — |  |  |  | 697 |  |  |  | — |
Financial |  |  | 2,843 |  |  |  | — |  |  |  | 2,843 |  |  |  | — |
Total short-term investments at fair value |  |  | 24,863 |  |  |  | 12,915 |  |  |  | 11,948 |  |  |  | — |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial |  |  | 502 |  |  |  | — |  |  |  | 502 |  |  |  | — |
Industrial |  |  | 1,450 |  |  |  | — |  |  |  | 1,450 |  |  |  | — |
Total assets at fair value |  | $ | 26,815 |  |  | $ | 12,915 |  |  | $ | 13,900 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related contingent consideration |  |  | 252 |  |  |  | — |  |  |  | — |  |  |  | 252 |
Total liabilities at fair value |  | $ | 252 |  |  | $ | — |  |  | $ | — |  |  | $ | 252 |
September 30, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial |  | $ | 10,308 |  |  | $ | — |  |  | $ | 10,308 |  |  | $ | — |
Industrial |  |  | 9,665 |  |  |  | — |  |  |  | 9,665 |  |  |  | — |
Utility |  |  | 1,802 |  |  |  | — |  |  |  | 1,802 |  |  |  | — |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Industrial |  |  | 1,448 |  |  |  | — |  |  |  | 1,448 |  |  |  | — |
Financial |  |  | 698 |  |  |  | — |  |  |  | 698 |  |  |  | — |
Total assets at fair value |  | $ | 23,921 |  |  | $ | — |  |  | $ | 23,921 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related contingent consideration |  |  | 47 |  |  |  | — |  |  |  | — |  |  |  | 47 |
Total liabilities at fair value |  | $ | 47 |  |  | $ | — |  |  | $ | — |  |  | $ | 47 |
Contingent Consideration [Member] |
Summary of Acquisition-related Contingent Consideration Measured at Fair Value | The following table includes a summary of the Acquisition-related contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the year ended September 30, 2016 (amounts shown in thousands):
Balance at September 30, 2015 |  |  |  |  |  | $ | 47 |
Expenses recorded due to changes in fair value |  |  |  |  | 293 |
Issuance of common stock |  |  |  |  |  |  | (88 | )
Balance at September 30, 2016 |  |  |  |  |  | $ | 252 |

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