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Marketable Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amortized Cost    
Amortized Cost $ 53,128 $ 69,725
Gross Unrealized Gains    
Gross Unrealized Gains 26  
Gross Unrealized Losses    
Gross Unrealized Losses (3) (13)
Fair Value    
Fair Value 53,151 69,712
U.S. government and municipal obligations    
Amortized Cost    
Maturing in one year or less 18,509 27,355
Amortized Cost 18,509 27,355
Gross Unrealized Gains    
Maturing in one year or less 13  
Gross Unrealized Gains 13  
Gross Unrealized Losses    
Maturing in one year or less   (4)
Gross Unrealized Losses   (4)
Fair Value    
Maturing in one year or less 18,522 27,351
Fair Value 18,522 27,351
Corporate debt securities    
Amortized Cost    
Maturing in one year or less 34,619 42,370
Amortized Cost 34,619 42,370
Gross Unrealized Gains    
Maturing in one year or less 13  
Gross Unrealized Gains 13  
Gross Unrealized Losses    
Maturing in one year or less (3) (9)
Gross Unrealized Losses (3) (9)
Fair Value    
Maturing in one year or less 34,629 42,361
Fair Value $ 34,629 $ 42,361