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STOCK-BASED COMPENSATION - Black-Scholes Option Pricing (Details) - $ / shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 14, 2021 | Jan. 02, 2020 | Jan. 02, 2019 | Sep. 30, 2021
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
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
Average risk-free interest rate |  |  |  | 1.94%
Expected option life (year) |  |  |  | 5 years
Volatility rate |  |  |  | 63.87%
Dividend yield |  |  |  | 0.00%
Tranche 16 [Member] |  |  |  |
Exercise price (US$) |  |  | $ 5.19 | $ 16.5
Average risk-free interest rate |  |  |  | 1.94%
Expected option life (year) |  |  |  | 5 years
Volatility rate |  |  |  | 52.40%
Dividend yield |  |  |  | 0.00%
Tranche 17 [Member] |  |  |  |
Exercise price (US$) |  | $ 5.3 |  | $ 8
Average risk-free interest rate |  |  |  | 2.26%
Expected option life (year) |  |  |  | 5 years
Volatility rate |  |  |  | 63.20%
Dividend yield |  |  |  | 0.00%
Tranche 18 [Member] |  |  |  |
Exercise price (US$) | $ 13.99 |  |  | $ 9.1
Average risk-free interest rate |  |  |  | 2.25%
Expected option life (year) |  |  |  | 5 years
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 years
Volatility rate |  |  |  | 68.20%
Dividend yield |  |  |  | 0.00%
Tranche 20 [Member] |  |  |  |
Exercise price (US$) |  |  |  | $ 5.19
Average risk-free interest rate |  |  |  | 2.49%
Expected option life (year) |  |  |  | 5 years
Volatility rate |  |  |  | 103.00%
Dividend yield |  |  |  | 0.00%
Tranche 21 [Member] |  |  |  |
Exercise price (US$) |  |  |  | $ 5.3
Average risk-free interest rate |  |  |  | 1.67%
Expected option life (year) |  |  |  | 5 years
Volatility rate |  |  |  | 52.60%
Dividend yield |  |  |  | 0.00%
Tranche 22 [Member] |  |  |  |
Exercise price (US$) |  |  |  | $ 15.85
Average risk-free interest rate |  |  |  | 0.87%
Expected option life (year) |  |  |  | 5 years
Volatility rate |  |  |  | 109.90%
Dividend yield |  |  |  | 0.00%

X
- 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=120381028&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=120381028&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=120381028&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 award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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=120381028&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=122041274&loc=d3e301413-122809 + Details
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