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INVESTMENTS - SUMMARY OF ACQUISITION-RELATED CONTINGENT CONSIDERATION MEASURED AT FAIR VALUE (Details) - Contingent Consideration - ICAR Vision Systems, S.L. $ in Thousands | 12 Months Ended
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Sep. 30, 2018 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
September 30, 2017 | $ 354
Issuance of contingent consideration | 2,867
Expenses recorded due to changes in fair value | 2,105
Payment of contingent consideration | (1,489)
Issuance of common stock | (710)
Foreign currency effect on contingent consideration | (76)
Balance at September 30, 2018 | $ 3,051

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