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INVESTMENTS - SUMMARY OF INVESTMENTS BY TYPE OF SECURITY (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Cost	$ 8,472	$ 34,075
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(24)	(16)
Fair Market Value	8,448	34,059
US Treasury | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	3,693	3,897
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(10)	(3)
Fair Market Value	3,683	3,894
Corporate debt securities | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	4,779	26,393
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(14)	(8)
Fair Market Value	$ 4,765	26,385
Corporate debt securities | Long-term investments
Debt Securities, Available-for-sale [Line Items]
Cost		3,785
Gross Unrealized Gains		0
Gross Unrealized Losses		(5)
Fair Market Value		$ 3,780

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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