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Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2022 USD ($) segment | Mar. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |
Reimbursement from National Institutes of Health research grants | $ | $ 0.1 | $ 0.6
Number of business segments | segment | 1 |
Vesting period of stock options | 4 years |
Leases-In-Place Agreements [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Intangible assets, Estimated useful lives | 2 years |
Building [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 | 9 years |
Tenant Improvements [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Property and equipment, Estimated useful lives | 2 years 1 month 6 days |

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