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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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