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Stockholders' Equity (Schedule of Fair Value of Employee Stock Options) (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%
Weighted average grant date fair value per share	$ 5.97	$ 3.85	$ 15.63	$ 3.82
Options to purchase common stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term in years		5 years 1 month 6 days		5 years 1 month 6 days
Expected volatility		71.00%
Risk-free interest rate		0.30%
Options to purchase common stock [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term in years	2 years 1 month 6 days		2 years 1 month 6 days
Expected volatility	67.00%		67.00%	57.00%
Risk-free interest rate, minimum	0.05%		0.05%	0.30%
Options to purchase common stock [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term in years	4 years 7 months 6 days		4 years 7 months 6 days
Expected volatility	80.00%		80.00%	71.00%
Risk-free interest rate, maximum	0.71%		0.74%	1.20%

X

- Definition

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

+ 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
-Subparagraph (f)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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

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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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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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