v3.19.3.a.u2

Stock-Based Compensation - Schedule of Assumptions Used in Black-Scholes Option-Pricing Method (Details) - $ / shares | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Expected dividend yield | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00%
Expected stock-price volatility, minimum | 69.00% | 48.89% | 46.33% | 46.47% | 46.47% | 53.08%
Expected stock-price volatility, maximum | 69.38% | 50.22% | 69.38% | 53.11% | 53.11% | 54.08%
Risk-free interest rate, minimum | 1.47% | 2.78% | 1.47% | 2.46% | 2.46% | 1.89%
Risk-free interest rate, maximum | 1.54% | 3.07% | 2.60% | 3.07% | 3.07% | 2.58%
Expected average term of options |  |  |  |  |  | 10 years
Stock price | $ 1.04 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Expected average term of options | 5 years | 7 years | 5 years | 5 years | 5 years |
Stock price |  | $ 1.85 | $ 0.60 | $ 1.85 | $ 1.85 | $ 0.30
Maximum [Member] |  |  |  |  |  |
Expected average term of options | 7 years | 10 years | 7 years | 10 years | 10 years |
Stock price |  | $ 2.22 | $ 1.04 | $ 3.40 | $ 3.40 | $ 3.48

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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. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum 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 No definition available. + Details
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- Definition The estimated measure of the minimum 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 No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + 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=116856206&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=115993241&loc=d3e301413-122809 + Details
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