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BALANCE SHEET COMPONENTS (Narrative) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |  |
Severance | [1] | $ 1,217 | $ 3,828
Chief Financial Officer [Member] | CFO Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance |  | $ 700 |
[1] | Includes the restructuring plan discussed in Note 3, severance payable in connection with the November 2017 departure of the Company's CFO of $0.7 million, and other severance payments.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Postemployment Benefits -URI http://asc.fasb.org/extlink&oid=6519534 + Details
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