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STOCKHOLDERS' EQUITY - STOCK OPTION ACTIVITY (Detail) - $ / shares | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Number of Shares |  |  |  |
Beginning balance (in shares) | 3,015,374 | 3,647,705 | 2,334,326 |
Granted (in shares) | 147,800 | 98,500 | 1,927,500 |
Exercised (in shares) | (235,514) | (661,663) | (232,203) |
Cancelled (in shares) | (81,794) | (69,168) | (381,918) |
Ending balance (in shares) | 2,845,866 | 3,015,374 | 3,647,705 | 2,334,326
Weighted Average Exercise Price Per Share |  |  |  |
Beginning balance (in dollars per share) | $ 3.95 | $ 3.70 | $ 4.11 |
Granted (in dollars per share) | 7.06 | 4.51 | 2.92 |
Exercised (in dollars per share) | 2.92 | 2.67 | 1.06 |
Cancelled (in dollars per share) | 3.59 | 4.51 | 3.85 |
Ending balance (in dollars per share) | $ 4.21 | $ 3.95 | $ 3.70 | $ 4.11
Additional Disclosures |  |  |  |
Weighted Average Remaining Contractual Term (in Years) | 5 years 5 months 1 day | 6 years 4 months 24 days | 7 years 2 months 12 days | 5 years 5 months 16 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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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