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Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) | Jun. 30, 2023 USD ($) segment shares | Jun. 30, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Reimbursement from National Institutes of Health research grants | $ | $ 0.4 | $ 0.0 | $ 0.5
Number of business segments | segment |  | 1 |
Vesting period of stock options |  | 4 years |
Lease-In-Place Agreements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets, Estimated useful lives |  | 9 months 18 days |
Buildings [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, Estimated useful lives |  | 39 years |
Site Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, Estimated useful lives |  | 10 years |
Tenant Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, Estimated useful lives |  | 10 months 24 days |
Restricted Stock [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Dilutive common stock options excluded from net loss per share, diluted | shares |  | 57,143 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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