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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