9. Stock-based Plans and Stock-based Compensation: Valuation Assumptions (Details) |
1 Months Ended | 12 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 11, 2019 |
Feb. 12, 2019 |
Jan. 07, 2019 |
Jun. 02, 2018 |
May 07, 2018 |
Jan. 08, 2018 |
Jan. 02, 2018 |
Nov. 19, 2019 |
Oct. 21, 2019 |
Aug. 21, 2019 |
May 17, 2019 |
Feb. 25, 2019 |
Feb. 18, 2019 |
Jan. 21, 2019 |
Apr. 16, 2018 |
Mar. 26, 2018 |
Feb. 15, 2018 |
Jan. 29, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||
| Expected life (years) | 6 years | 6 years 22 days | ||||||||||||||||||
| Expected dividend yield | 0.00% | 0.00% | ||||||||||||||||||
| Expected volatility | 90.90% | 90.79% | 90.82% | 95.44% | 101.42% | 104.06% | 104.04% | 78.70% | 74.18% | 80.17% | 80.17% | 90.88% | 90.88% | 90.75% | 102.07% | 101.94% | 103.60% | 103.49% | ||
| Minimum [Member] | ||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||
| Risk-free interest rate | 1.49% | 2.24% | ||||||||||||||||||
| Expected volatility | 74.18% | 90.88% | ||||||||||||||||||
| Maximum [Member] | ||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||
| Risk-free interest rate | 2.65% | 3.10% | ||||||||||||||||||
| Expected volatility | 90.90% | 104.06% | ||||||||||||||||||
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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