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Stock-Based Compensation - FV of employee stock options (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Options to purchase common stock |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |
Common stock fair value per share minimum | 30.65 | 20.69 | 29.96
Common stock fair value per share maximum | 49.47 | 45.91 | 44.19
Expected volatility, low end of range (as a percent) | 53.91% | 52.93% | 60.67%
Expected volatility, high end of range (as a percent) | 56.82% | 58.95% | 61.33%
Risk-free interest rate, low end of range (as a percent) | 0.47% | 0.29% | 1.37%
Risk-free interest rate, high end of range (as a percent) | 1.33% | 1.71% | 2.60%
Compensation expense |  |  |
Unamortized compensation expense related to unvested awards | $ 54.5 | $ 48.9 |
Period to recognize unamortized compensation expense | 2 years 7 months 13 days |  |
Options to purchase common stock | Minimum |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |
Expected term (years) | 6 years | 5 years 2 months 23 days | 5 years 2 months 23 days
Options to purchase common stock | Maximum |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |
Expected term (years) | 7 years 7 months 24 days | 7 years 7 months 24 days | 6 years 7 months 2 days
Employee stock purchase plan |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |
Expected volatility, low end of range (as a percent) | 46.08% | 50.77% | 50.77%
Expected volatility, high end of range (as a percent) | 66.37% | 66.37% | 71.37%
Risk-free interest rate, low end of range (as a percent) | 0.04% | 0.09% | 1.47%
Risk-free interest rate, high end of range (as a percent) | 1.65% | 1.65% | 2.70%
Compensation expense |  |  |
Unamortized compensation expense related to unvested awards | $ 2.3 | $ 0.9 |
Period to recognize unamortized compensation expense | 1 year 11 months 8 days |  |
Employee stock purchase plan | Minimum |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |
Expected term (years) | 6 months | 6 months | 6 months
Employee stock purchase plan | Maximum |  |  |
Weighted average assumptions for estimated fair value of employee stock options |  |  |
Expected term (years) | 2 years | 2 years | 2 years

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for 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 (i) -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 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=122041274&loc=d3e301413-122809 + Details
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- Definition The estimated fair value of the entity's common stock at the date of grant of stock options, used as an input in calculating the grant date fair value of the options maximum. + References No definition available. + Details
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