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INVESTMENTS (Tables) | 12 Months Ended
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Sep. 30, 2017
Gain (Loss) on Investments [Line Items] |
Summary of Investments by Type of Security | The following tables summarize investments by security type as of September 30, 2017 and 2016 (amounts shown in thousands):
| September 30, 2017
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Available-for-sale securities: |  |  |  |  |  |  |
US Treasury | $ | 3,897 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 3,894 |
Corporate debt securities, short-term | 26,393 |  |  | — |  |  | (8 | ) |  | 26,385 |
Corporate debt securities, long-term | 3,785 |  |  | — |  |  | (5 | ) |  | 3,780 |
Total | $ | 34,075 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 34,059 |
| September 30, 2016
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury, short-term | $ | 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 |
Summary of Fair Value of Investments Measured on Recurring Basis | The following tables represent the fair value hierarchy of the Company’s investments and acquisition-related contingent consideration as of September 30, 2017 and 2016 (amounts shown in thousands):
| Balance |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
September 30, 2017: |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |
U.S. Treasury | $ | 3,894 |  |  | $ | 3,894 |  |  | $ | — |  |  | $ | — |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Financial | 3,041 |  |  | — |  |  | 3,041 |  |  | — |
Industrial | 9,503 |  |  | — |  |  | 9,503 |  |  | — |
Commercial paper |  |  |  |  |  |  |  |  |  |  |
Financial | 10,850 |  |  | — |  |  | 10,850 |  |  | — |
Industrial | 2,991 |  |  | — |  |  | 2,991 |  |  | — |
Total short-term investments at fair value | 30,279 |  |  | 3,894 |  |  | 26,385 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
U.S. Treasury | — |  |  | — |  |  | — |  |  | — |
Corporate debt securities |  |  |  |  |  |  |
Financial | 1,858 |  |  | — |  |  | 1,858 |  |  | — |
Industrial | 1,922 |  |  | — |  |  | 1,922 |  |  | — |
Total assets at fair value | $ | 34,059 |  |  | $ | 3,894 |  |  | $ | 30,165 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Acquisition-related contingent consideration | 354 |  |  | — |  |  | — |  |  | 354 |
Total liabilities at fair value | $ | 354 |  |  | $ | — |  |  | $ | — |  |  | $ | 354 |
| 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: |  |  |  |  |  |  |
U.S. Treasury | $ | 12,915 |  |  | $ | 12,915 |  |  | $ | — |  |  | $ | — |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Financial | 3,963 |  |  | — |  |  | 3,963 |  |  | — |
Industrial | 4,445 |  |  | — |  |  | 4,445 |  |  | — |
Commercial paper |  |  |  |  |  |  |  |  |  |  |
Financial | 2,843 |  |  | — |  |  | 2,843 |  |  | — |
Industrial | 697 |  |  | — |  |  | 697 |  |  | — |
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 |
Contingent Consideration |
Gain (Loss) on Investments [Line Items] |
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, 2017 (amounts shown in thousands):
Balance at September 30, 2016 | $ | 252 |
Expenses recorded due to changes in fair value | 412 |
Issuance of common stock | (310 | )
Balance at September 30, 2017 | $ | 354 |

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