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INVESTMENTS - SUMMARY OF FAIR VALUE OF INVESTMENTS MEASURED ON A RECURRING BASIS (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | $ 30,279
Total assets at fair value | $ 8,448 | 34,059
Acquisition-related contingent consideration | 3,051 | 354
Total liabilities at fair value | 3,051 | 354
US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 3,683 | 3,894
Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 2,847 | 3,041
Long-term investments at fair value |  | 1,858
Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 1,918 | 9,503
Long-term investments at fair value |  | 1,922
Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 10,850
Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 2,991
Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 3,894
Total assets at fair value | 3,683 | 3,894
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 3,683 | 3,894
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Long-term investments at fair value |  | 0
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Long-term investments at fair value |  | 0
Quoted Prices in Active Markets (Level 1) | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 0
Quoted Prices in Active Markets (Level 1) | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 26,385
Total assets at fair value | 4,765 | 30,165
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 2,847 | 3,041
Long-term investments at fair value |  | 1,858
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 1,918 | 9,503
Long-term investments at fair value |  | 1,922
Significant Other Observable Inputs (Level 2) | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 10,850
Significant Other Observable Inputs (Level 2) | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 2,991
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 0
Total assets at fair value | 0 | 0
Acquisition-related contingent consideration | 3,051 | 354
Total liabilities at fair value | 3,051 | 354
Significant Unobservable Inputs (Level 3) | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Long-term investments at fair value |  | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | $ 0 | 0
Long-term investments at fair value |  | 0
Significant Unobservable Inputs (Level 3) | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | 0
Significant Unobservable Inputs (Level 3) | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value |  | $ 0

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