Stock-Based Compensation - Fair Value of Stock Options Granted and Purchase Rights Issued under the ESPP (Details) - $ / shares	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 4.11	$ 2.02
Employee Stock Purchase Plan \| Stock Options
Expected dividend yield
Risk-free interest rate, minimum	1.46%	0.62%
Risk-free interest rate, maximum	3.34%	1.67%
Expected Volatility, minimum	90.00%	91.00%
Expected Volatility, maximum	95.00%	96.00%
Employee Stock Purchase Plan \| Stock Options \| Minimum
Expected life (years)	5 years 9 months 18 days	5 years 2 months 12 days
Employee Stock Purchase Plan \| Stock Options \| Maximum
Expected life (years)	6 years 1 month 6 days	6 years 1 month 6 days
Employee Stock Purchase Plan \| Employee Purchase Rights
Expected dividend yield
Risk-free interest rate, minimum	0.69%
Risk-free interest rate, maximum	3.92%
Expected Volatility, minimum	80.00%
Expected Volatility, maximum	129.00%
Expected life (years)	6 months

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.

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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.

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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

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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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
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section S99
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-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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