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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Amortized intangible assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Finite-lived intangible asset      
Amortization period 15 years    
Impairment of intangible assets $ 0 $ 0 $ 0
Developed technology      
Finite-lived intangible asset      
Gross Carrying Amount 51,000    
Accumulated Amortization $ 1,134