The amount of liability recorded for the early exercise of stock options.

No definition available.

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Term of award in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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No definition available.

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Percentage of automatic annual increase in shares reserved for issuance.

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- Definition

Minimum percentage at which the shares are permitted to be purchased under the shares based arrangement.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Aggregate number of common shares reserved for future issuance.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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

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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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of share options (or share units) exercised during the current period.

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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 01, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding		2,657,333		2,657,333		1,473,359
Stock-based compensation expense		$ 474	$ 31	$ 1,159	$ 95
Expected dividend yield				0.00%
Exercise of stock options (in shares)				11,783
2001 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance	2,674,749
Number of shares available for grant		600,373		600,373
Vesting Period	4 years
2001 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	10 years
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance		278,170		278,170
Shares issued/purchased under ESPP				0
Annual incremental percentage		1.00%		1.00%
Minimum Percentage		85.00%		85.00%
2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance		1,854,490		1,854,490
Number of shares available for grant		1,791,888		1,791,888
Annual incremental percentage		5.00%		5.00%
2021 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, term				10 years
Options to purchase common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding		9,993		9,993
Options to purchase common stock \| 2001 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period				48 months
Stock options with early exercise option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of stock options (in shares)				0	0
Liability recorded		$ 0	$ 0	$ 0	$ 0
Performance based shares contingent on certain milestones
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period				48 months
Performance stock options outstanding		10,493		10,493
Stock-based compensation expense				$ 0