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.

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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

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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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)
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-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

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STOCK-BASED COMPENSATION (Details 1) - $ / shares	1 Months Ended	12 Months Ended
STOCK-BASED COMPENSATION (Details 1) - $ / shares	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%