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STOCKHOLDERS' EQUITY - STOCK-BASED COMPENSATION EXPENSE RELATED TO STOCK OPTIONS AND RSUs (Details) - USD ($) $ in Thousands	12 Months Ended
	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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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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