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STOCKHOLDERS' EQUITY - STOCK OPTION ACTIVITY (Details) - $ / shares | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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