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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Sep. 30, 2021
STOCK-BASED COMPENSATION |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of the stock option activity under the 2005, 2009 and 2014 Plans is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche | ​ | Tranche
​ | ​ | 9 | ​ | 10 | ​ | 11 | ​ | 12 | ​ | 13 | ​ | 14 | ​ | 15 | ​ | 16 | ​ | 17 | ​ | 18 | ​ | 19 | ​ | 20 |  | 21 | ​ | 22
​ | ​ | January 2, | ​ | January 2, | ​ | January 4, | ​ | April 19, | ​ | May 16, | ​ | August 3, | ​ | January 3, | ​ | October 2, | ​ | December 22, | ​ | January 2, | ​ | March 1, | ​ | January 2, | ​ | January 2, | ​ | April 14,
Grant date | ​ | 2014 | ​ | 2015 | ​ | 2016 | ​ | 2016 | ​ | 2016 | ​ | 2016 | ​ | 2017 | ​ | 2017 | ​ | 2017 | ​ | 2018 | ​ | 2018 | ​ | 2019 |  | 2020 |  | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​
Outstanding as of September 30, 2019 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Number of options granted | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Options exercised | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Options cancelled/expired | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Outstanding as of September 30, 2020 | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Number of options granted |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Options exercised |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Options cancelled/expired | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Outstanding as of September 30, 2021 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Options vested and exercisable | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At September 30, 2020 | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
At September 30, 2021 | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Weighted average fair value at the grant date (US$) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of each option granted is estimated on the date of grant using the Black-Scholes Option Pricing Model: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Tranche |  |  | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​ | Tranche | ​
​ | ​ | 9 | ​ | ​ | 10 | ​ | 11 | ​ | 12 | ​ | 13 | ​ | 14 | ​ | 15 | ​ | 16 | ​ | 17 | ​ | 18 | ​ | 19 | ​ | 20 | ​ | 21 | ​ | 22 | ​
Exercise price (US$) | ​ | — | ​ | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​
Average risk-free interest rate | ​ | — | ​ | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​
Expected option life (year) | ​ | — | ​ | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​
Volatility rate | ​ | — | ​ | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​
Dividend yield | ​ | — | ​ | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI https://asc.fasb.org/extlink&oid=128089324&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 (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: 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) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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