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Investments - Summary of Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Cost $ 31,811 $ 22,352
Gross unrealized gains 242 7
Gross unrealized losses (47) (222)
Fair value 32,006 22,137
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities    
Debt Securities, Available-for-sale [Line Items]    
Cost 26,487 21,729
Gross unrealized gains 174 7
Gross unrealized losses (39) (222)
Fair value 26,622 21,514
Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Cost 5,324 623
Gross unrealized gains 68  
Gross unrealized losses (8)  
Fair value $ 5,384 $ 623