Significant Accounting Policies - Key Assumptions Estimate Fair Value Of Stock Options (Details) - USD ($) $ in Millions |
3 Months Ended | |
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Dec. 31, 2019 |
Dec. 31, 2018 |
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| Key assumptions used to estimate the fair value of the stock options granted | ||
| Expected common stock price volatility | 76.00% | |
| Risk-free interest rate | 2.50% | |
| Minimum | ||
| Key assumptions used to estimate the fair value of the stock options granted | ||
| Expected term of options (years) | 6 years 11 months 16 days | 5 years 6 months |
| Maximum | ||
| Key assumptions used to estimate the fair value of the stock options granted | ||
| Expected term of options (years) | 7 years | 6 years |
| Restatement Adjustment | ||
| Key assumptions used to estimate the fair value of the stock options granted | ||
| Net decrease in share-based compensation expense | $ 0.2 | |
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- Definition The amount of decrease in share-based compensation expense during the period. No definition available.
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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