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14. STOCK-BASED COMPENSATION - Fair Value Assumptions 2021 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Expected dividends | $ 0 | $ 0
Restricted Stock Units (RSUs) [Member] |  |
Risk free interest rate | 4.59% |
Expected term (years) | 10 years |
Expected volatility | 129.70% |
Cost of equity | 21.55% |
Minimum [Member] |  |
Risk free interest rate | 2.65% | 1.04%
Expected term (years) | 5 years 21 days | 4 years 11 months 26 days
Expected volatility | 157.10% | 187.20%
Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |
Risk free interest rate |  | 0.14%
Expected term (years) |  | 1 year
Expected volatility |  | 111.37%
Cost of equity |  | 20.00%
Maximum [Member] |  |
Risk free interest rate | 4.44% | 3.65%
Expected term (years) | 5 years 10 months 6 days | 7 years 4 months 6 days
Expected volatility | 194.90% | 533.00%
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |
Risk free interest rate |  | 1.26%
Expected term (years) |  | 5 years
Expected volatility |  | 172.18%
Cost of equity |  | 21.00%

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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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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