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Stockholders' Equity, Stock-based Valuation Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Employee Stock Options [Member] |  |  |
Weighted-Average Assumptions [Abstract] |  |  |
Risk-free interest rate | 0.60% | 1.50% | 2.30%
Dividend yield | 0.00% | 0.00% | 0.00%
Volatility | 54.00% | 58.60% | 60.30%
Expected life | 4 years 10 months 24 days | 4 years 8 months 12 days | 4 years 9 months 18 days
Board of Director Stock Options [Member] |  |  |
Weighted-Average Assumptions [Abstract] |  |  |
Risk-free interest rate | 1.20% | 0.50% | 1.90%
Dividend yield | 0.00% | 0.00% | 0.00%
Volatility | 55.90% | 57.60% | 60.70%
Expected life | 7 years 3 months 18 days | 6 years 8 months 12 days | 6 years 7 months 6 days
ESPP [Member] |  |  |
Weighted-Average Assumptions [Abstract] |  |  |
Risk-free interest rate | 0.10% | 0.80% | 2.40%
Dividend yield | 0.00% | 0.00% | 0.00%
Volatility | 42.40% | 47.90% | 45.60%
Expected life | 6 months | 6 months | 6 months

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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 risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Rate of weighted-average expected volatility for 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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