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Goodwill and Intangible Assets - Goodwill fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Level 1    
Assets    
Goodwill $ 0 $ 0
Level 2    
Assets    
Goodwill 0 0
Level 3    
Assets    
Goodwill $ 2,108 $ 2,050