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BALANCE SHEET COMPONENTS (Narrative) (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Severance	[1]	$ 976	$ 3,828
Chief Financial Officer [Member] | CFO Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance		$ 600
[1] Includes the restructuring plan discussed in Note 3, severance payable in connection with the November 2017 departure of the Company's Chief Financial Officer of $0.6 million, and other severance payments.

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Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment.

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