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Stock-based Compensation - Summary of Fair Value of Each Option Grant Estimated Using Black-Scholes Option-pricing Model (Details) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Expected term (years) |  |  |  |  | 3 years |
Common stock (price per share) |  | $ 64.96 |  |  | $ 64.96 |
Expected volatility | [1] | 49.30% |  | 44.60% | 44.60% |
Expected volatility | [1] | 51.90% |  | 49.30% | 49.30% |
Risk-free interest rate | [2] | 0.40% |  |  | 1.60% |
Risk-free interest rate | [2] | 1.80% |  |  | 1.90% |
Dividend yield | [3] | 0.00% |  |  | 0.00% | [4]
Minimum [Member] |  |  |  |  |  |
Expected term (years) | [5] | 5 years 11 months 15 days | 5 years 3 months 7 days |  | 5 years 3 months 7 days |
Common stock (price per share) |  | $ 22.80 |  |  | $ 17.38 |
Maximum [Member] |  |  |  |  |  |
Expected term (years) | [5] | 6 years 7 days | 6 years 7 days |  | 6 years 7 days |
Common stock (price per share) |  | $ 76.93 |  |  | $ 22.80 |
[1] | Volatility, or the standard deviation of annualized returns, was calculated based on comparable companies’ report volatilities.
[2] | Risk free rate was obtained from US treasury notes for the expected terms noted as of the valuation date.
[3] | The Company has assumed a dividend yield of zero as they have no plans to declare dividends in the foreseeable future.
[4] | The Company has assumed a dividend yield of zero as it has no plans to declare dividends in the foreseeable future.
[5] | The expected term is the length of time the grant is expected to be outstanding before it is exercised or terminated. This number is calculated as the midpoint between the vesting term and the original contractual term (contractual period to exercise). If the option contains graded vesting, then the vesting term would be based on the vesting pattern.

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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=120381028&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=120381028&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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