8. Stock-based Plans and Stock-based Compensation: Valuation Assumptions (Details) |
1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Aug. 14, 2017 |
May 15, 2017 |
Mar. 26, 2018 |
Nov. 30, 2017 |
Jun. 28, 2017 |
Mar. 23, 2017 |
Dec. 31, 2018 |
Jun. 30, 2018 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
| Expected life (years) | 6 years 22 days | 6 years | ||||||||
| Expected dividend yield | 0.00% | 0.00% | ||||||||
| Expected volatility | 86.00% | 85.00% | 102.00% | 84.00% | 86.00% | 86.00% | 84.00% | 84.00% | ||
| Minimum [Member] | ||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
| Risk-free interest rate | 2.24% | 1.86% | ||||||||
| Expected volatility | 90.88% | 84.42% | ||||||||
| Maximum [Member] | ||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
| Risk-free interest rate | 3.10% | 2.20% | ||||||||
| Expected volatility | 104.06% | 85.79% | ||||||||
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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 share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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