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Stock-Based Compensation - Valuation Assumptions for ESPP (Details) - 2012 Purchase Plan	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Jun. 30, 2020	Jun. 30, 2019
Valuation Assumptions
Risk-free interest rate	0.20%	0.10%	1.80%	2.10%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Expected life (in years)	6 months	6 months	6 months	6 months
Expected volatility	94.00%	60.00%	99.00%	55.00%

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- References

No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (f)(2)(iii)
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- Definition

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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- 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.

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