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Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended
	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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Reduction To Research And Development Expense

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Significant Accounting Policies [Line Items]

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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