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Company and Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - Equity Incentive 2011 Plan [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Significant Accounting Policies [Line Items]
Expected term (in years)	6 years	6 years	6 years	6 years
Weighted average volatility (percentage)	120.67%	116.64%	120.14%	108.56%
Weighted average risk free interest rate (percentage)	0.93%	0.42%	0.94%	0.46%
Expected dividends	0.00%	0.00%	0.00%	0.00%
Weighted-average expected forfeiture rate (percentage)	11.03%	8.79%	12.25%	8.64%

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- Definition

Share-based compensation arrangement by Share-based payment award, fair value assumptions, weighted-average expected forfeiture rate

+ References

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Significant Account Policies [Line Items]

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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.

+ References

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-Publisher FASB
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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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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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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