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STOCKHOLDERS' EQUITY - STOCK OPTION ACTIVITY (Details) - $ / shares	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Number ofShares
Beginning balance (in shares)	2,845,866	3,015,374	3,647,705
Granted (in shares)	299,397	147,800	98,500
Exercised (in shares)	(250,823)	(235,514)	(661,663)
Canceled (in shares)	(88,076)	(81,794)	(69,168)
Ending balance (in shares)	2,806,364	2,845,866	3,015,374	3,647,705
Weighted- Average Exercise Price Per Share
Beginning balance (in dollars per share)	$ 4.21	$ 3.95	$ 3.70
Granted (in dollars per share)	8.60	7.06	4.51
Exercised (in dollars per share)	2.96	2.92	2.67
Cancelled (in dollars per share)	5.23	3.59	4.51
Ending balance (in dollars per share)	$ 4.75	$ 4.21	$ 3.95	$ 3.70
Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term (in Years)	4 years 7 months 6 days	5 years 4 months 24 days	6 years 4 months 24 days	7 years 2 months 12 days

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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