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Marketable Securities - Schedule of Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 149,680 $ 54,384
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 1 Year 6,054  
1-5 Years 14,468  
5-10 Years 1,633  
Greater than 10 Years 0  
Fair Value 22,155 4,098
Government securities - U.S.    
Debt Securities, Available-for-sale [Line Items]    
Less than 1 Year 0  
1-5 Years 13,827  
5-10 Years 2,038  
Greater than 10 Years 3,134  
Fair Value 18,999 5,446
Other fixed-income securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 1 Year 1,017  
1-5 Years 2,837  
5-10 Years 0  
Greater than 10 Years 0  
Fair Value 3,854 $ 1,637
Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 1 Year 7,071  
1-5 Years 31,132  
5-10 Years 3,671  
Greater than 10 Years 3,134  
Fair Value $ 45,008