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Cash Equivalents And Restricted Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted securities | $ 538,000 |  | $ 538,000 |  | $ 546,000
Gross realized gains or losses on cash equivalents | 0 | $ 0 | 0 | $ 0 |
Money Market Funds [Member] |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted securities | 538,000 |  | 538,000 |  | 546,000
Maturity Date Within Three Months [Member] | Money Market Funds [Member] |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted securities | $ 538,000 |  | $ 538,000 |  | $ 546,000
Maximum [Member] | Maturity Date Within Three Months [Member] | Money Market Funds [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted securities maturity period |  |  | 3 months |  | 3 months

X
- Definition Period between issuance and maturity of investment other than investment in equity security, investment in debt security and equity method investment, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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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. + References No definition available. + Details
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- Definition This element represents the current portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
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