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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Total $ 2,879 $ 4,543
Level 1    
Assets:    
Total
Level 2    
Assets:    
Total 2,879 4,543
Level 3    
Assets:    
Total
Corporate bonds and notes    
Assets:    
Total 1,338 1,832
Corporate bonds and notes | Level 1    
Assets:    
Total
Corporate bonds and notes | Level 2    
Assets:    
Total 1,338 1,832
Corporate bonds and notes | Level 3    
Assets:    
Total
Municipal bonds    
Assets:    
Total 1,541 2,711
Municipal bonds | Level 1    
Assets:    
Total
Municipal bonds | Level 2    
Assets:    
Total 1,541 2,711
Municipal bonds | Level 3    
Assets:    
Total