Stockholders' Equity (Equity Incentive Plans) (Narrative) (Details) - shares |
1 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2018 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2016 |
Dec. 31, 2019 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
| Shares authorized | 400,000 | |||||
| Additional shares authorized | 600,000 | |||||
| Shares available for grant | 1,000,000 | |||||
| Predetermined offering period, lower fair market value percentage | 85.00% | |||||
| Number of shares purchased under ESPP | 114,321 | 140,856 | ||||
| Shares available for future sale | 744,823 | |||||
| Stock Options [Member] | ||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
| Shares authorized | 5,000,000 | 2,000,000 | ||||
| Expiration period | 10 years | |||||
| Additional shares authorized | 3,000,000 | 3,000,000 | ||||
| Shares available for grant | 8,000,000 | 5,000,000 | ||||
| Shares available for future sale | 3,447,642 | |||||
| X | ||||||||||
- Definition Employee stock purchase plan, predetermined offering period, lower fair market value percentage. No definition available.
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- Definition Aggregate number of common shares reserved for future issuance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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| X | ||||||||||
- Definition Number of additional shares authorized for issuance under share-based payment arrangement. No definition available.
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- Definition Number of shares authorized for issuance under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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