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Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2020 GBP (£) country | Dec. 31, 2020 USD ($) country
Accounting Policies [Line Items] |  |  |  |
Right-of-use lease asset |  | $ 1,264,000 |  | $ 1,227,000
Cash and cash equivalents |  | 11,885,000 |  | 33,406,000
Lease liability |  | 1,191,000 |  | 1,057,000
Cash exceeding balance insured by FDIC |  |  |  | 31,800,000
Cash balance insured by FSCS | £ |  |  | £ 85,000 |
Cash exceeding balance insured by FSCS |  |  |  | $ 1,300,000
Number of operating segments | segment | 1 |  |  |
Number of reportable segments | segment | 1 |  |  |
Number of geographic areas for development operations | country |  |  | 2 | 2
Tax on other comprehensive income (loss) | $ 0 | 0 |  |
Reclassifications out of other comprehensive income (loss) | $ 0 | 0 |  |
Lease, practical expedients package | true |  |  |
Board Director [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Stock-based awards vesting period | 1 year |  |  |
ManRos Therapeutics SA ("ManRos") [Member] | Collaboration, Supply and Licensing Agreements [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Payment received from achieving a clinical milestone | $ 0 | $ 0 |  |
Minimum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Stock-based awards vesting period | 3 years |  |  |
Maximum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Cash balances insured by FDIC |  |  |  | $ 250,000
Stock-based awards vesting period | 4 years |  |  |
ASU 2016-02 [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Operating lease liability |  |  |  | 1,500,000
Right-of-use lease asset |  |  |  | $ 1,500,000
Property, plant and equipment | Minimum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful life | 3 years |  |  |
Property, plant and equipment | Maximum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful life | 5 years |  |  |
Leasehold Improvements [Member] | Minimum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful life | 5 years |  |  |
Leasehold Improvements [Member] | Maximum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful life | 15 years |  |  |

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