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Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($) segment shares | Mar. 31, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |
Reimbursement from National Institutes of Health research grants | $ | $ 0.0 | $ 0.1
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 | 1 year |
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 | 1 year 1 month 6 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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599 + Details
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