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Stockholders' Equity (Schedule of Fair Value of Employee Stock Purchase Plan) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	67.00%	71.00%
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate		0.10%
Risk-free interest rate, minimum	0.06%		0.06%	0.10%
Risk-free interest rate, maximum	0.20%		0.20%	1.00%
Dividend yield
Weighted average grant date fair value, Granted	$ 16.73	$ 3.13	$ 25.07	$ 1.87
ESPP [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term in years	6 months	6 months	6 months	6 months
Expected volatility			67.00%	57.00%
ESPP [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term in years	2 years	2 years	2 years	2 years
Expected volatility			68.00%	71.00%

X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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.

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- Definition

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

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-Publisher FASB
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- Definition

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

+ References

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

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- Definition

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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