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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