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Investments - Schedule of Investments' Gross Unrealized Loss and Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months   $ 6,323
Unrealized Losses, Less than 12 Months   (6)
Fair Value, 12 Months or More $ 8,051 12,734
Unrealized Losses, 12 Months or More (47) (216)
Fair Value 8,051 19,057
Unrealized Losses (47) (222)
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months   5,866
Unrealized Losses, Less than 12 Months   (6)
Fair Value, 12 Months or More 7,053 12,634
Unrealized Losses, 12 Months or More (39) (216)
Fair Value 7,053 18,500
Unrealized Losses (39) (222)
Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months   457
Unrealized Losses, Less than 12 Months   0
Fair Value, 12 Months or More 998 100
Unrealized Losses, 12 Months or More (8) 0
Fair Value 998 557
Unrealized Losses $ (8) $ 0