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STOCKHOLDERS' EQUITY - STOCK-BASED COMPENSATION EXPENSE RELATED TO STOCK OPTIONS AND RSUs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to employee stock options included in expenses | $ 8,950 | $ 5,478 | $ 4,079
Cost of revenue |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to employee stock options included in expenses | 78 | 52 | 39
Sales and marketing |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to employee stock options included in expenses | 2,656 | 1,577 | 1,099
Research and development |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to employee stock options included in expenses | 1,801 | 1,028 | 660
General and administrative |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense related to employee stock options included in expenses | $ 4,415 | $ 2,821 | $ 2,281

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