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Goodwill and Intangible Assets - Net Book Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Unamortizable intangible assets:    
Unamortizable intangible assets: Goodwill, Gross Value $ 16,836 $ 18,491
Unamortizable intangible assets: Accumulated Amortization 0 0
Unamortizable intangible assets: Net Book Value 16,836 18,491
Disposal Group, Disposed of by Sale, Not Discontinued Operations | The Business    
Unamortizable intangible assets:    
Unamortizable intangible assets: Net Book Value 1,655  
In Process Research and Development | Vazculep    
Amortizable intangible assets:    
Amortizable intangible assets: Gross Value 0 12,061
Amortizable intangible assets: Accumulated Amortization 0 (11,248)
Amortizable intangible assets: Net Carrying Amount $ 0 $ 813