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Stock-based Compensation - Weighted-Average assumptions (Details) - $ / shares	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Weighted-average assumptions
Expected term	6 years 3 months	6 years 3 months
Expected volatility	101.79%	81.26%
Risk-free interest rate	4.17%	3.54%
Expected dividend yield	0.00%	0.00%
2013 Equity Incentive and Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award
Weighted-average fair value of the options granted	$ 1.49	$ 2.00

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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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The estimated measure of the 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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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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.

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