CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Common Stock to Employees (Details) - Employee - $ / shares |
9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Risk-free interest rate, Minimum | 0.30% | 1.90% | 1.70% | 2.70% |
| Risk-free interest rate, Maximum | 1.70% | 2.60% | 2.60% | 3.00% |
| Expected volatility, Minimum | 52.70% | 53.30% | 52.70% | 52.90% |
| Expected volatility, Maximum | 54.20% | 53.60% | 53.60% | 53.80% |
| Expected life, Minimum (in years) | 5 years 10 months 24 days | 5 years 7 months 6 days | 5 years 7 months 6 days | 5 years 3 months 18 days |
| Expected life, Maximum (in years) | 6 years 3 months 18 days | 6 years 1 month 6 days | 6 years 1 month 6 days | 6 years 1 month 6 days |
| Fair value of Common Stock | $ 4.08 | $ 4.08 | $ 3.39 | |
| Minimum | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Fair value of Common Stock | $ 1.71 | |||
| Maximum | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Fair value of Common Stock | $ 9.75 | |||
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- Definition Maximum 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. No definition available.
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- Definition Minimum 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. No definition available.
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. No definition available.
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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. No definition available.
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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. No definition available.
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. No definition available.
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. No definition available.
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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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