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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SUMMARY OF PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost $ 7,770 $ 3,186
Less: accumulated depreciation and amortization (3,105) (2,573)
Total property and equipment, net 4,665 613
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 3,825 1,128
Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 2,604 1,801
Capitalized internal-use software development costs    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 916 0
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost $ 425 $ 257