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STOCK-BASED COMPENSATION (Details 1) - $ / shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2007
Exercise price (US$) |  | $ 16.5 |
Average risk-free interest rate |  | 1.94% |
Expected option life (year) |  |  | 5 years
Volatility rate |  | 52.40% |
Dividend yield |  | 0.00% |
Tranche 7 [Member] |  |  |
Exercise price (US$) |  | $ 25.5 |
Average risk-free interest rate |  | 0.40% |
Expected option life (year) |  |  | 3 years
Volatility rate |  | 90.30% |
Dividend yield |  | 0.00% |
Tranche 8 [Member] |  |  |
Exercise price (US$) |  | $ 14.4 |
Average risk-free interest rate |  | 0.37% |
Expected option life (year) |  |  | 3 years
Volatility rate |  | 86.32% |
Dividend yield |  | 0.00% |
Tranche 9 [Member] |  |  |
Exercise price (US$) |  | $ 12.7 |
Average risk-free interest rate |  | 0.76% |
Expected option life (year) |  |  | 3 years
Volatility rate |  | 79.20% |
Dividend yield |  | 0.00% |
Tranche 10 [Member] |  |  |
Exercise price (US$) |  | $ 14.8 |
Average risk-free interest rate |  | 1.07% |
Expected option life (year) |  |  | 3 years
Volatility rate |  | 79.67% |
Dividend yield |  | 0.00% |
Tranche 11 [Member] |  |  |
Exercise price (US$) |  | $ 13.8 |
Average risk-free interest rate |  | 1.73% |
Expected option life (year) |  |  | 5 years
Volatility rate |  | 80.72% |
Dividend yield |  | 0.00% |
Tranche 12 [Member] |  |  |
Exercise price (US$) |  | $ 20.5 |
Average risk-free interest rate |  | 1.79% |
Expected option life (year) |  |  | 10 years
Volatility rate |  | 69.27% |
Dividend yield |  | 0.00% |
Tranche 13 [Member] |  |  |
Exercise price (US$) |  | $ 16.5 |
Average risk-free interest rate |  | 1.75% |
Expected option life (year) |  |  | 10 years
Volatility rate |  | 69.92% |
Dividend yield |  | 0.00% |
Tranche 14 [Member] |  |  |
Exercise price (US$) |  | $ 20.0 |
Average risk-free interest rate |  | 1.55% |
Expected option life (year) |  |  | 10 years
Volatility rate |  | 65.37% |
Dividend yield |  | 0.00% |
Tranche 15 [Member] |  |  |
Exercise price (US$) | $ 20.7 | $ 20.7 |
Average risk-free interest rate |  | 1.94% |
Expected option life (year) |  |  | 5 years
Volatility rate |  | 63.87% |
Dividend yield |  | 0.00% |
Tranche 17 [Member] |  |  |
Exercise price (US$) |  | $ 8.0 |
Average risk-free interest rate |  | 2.26% |
Expected option life (year) |  | 5 days |
Volatility rate |  | 63.20% |
Dividend yield |  | 0.00% |
Tranche 18 [Member] |  |  |
Exercise price (US$) |  | $ 9.1 |
Average risk-free interest rate |  | 2.25% |
Expected option life (year) |  | 5 days |
Volatility rate |  | 64.60% |
Dividend yield |  | 0.00% |
Tranche 19 [Member] |  |  |
Exercise price (US$) |  | $ 8.2 |
Average risk-free interest rate |  | 2.58% |
Expected option life (year) |  | 5 days |
Volatility rate |  | 68.20% |
Dividend yield |  | 0.00% |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Expected term of share-based compensation awards, 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 (f)(2)(i) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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