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Fair Value of Financial Instruments (Details) - Marketable securities - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Quoted Prices in Active Markets (Level 1)    
Assets    
Marketable securities $ 8,984 $ 10,433
Significant Other Observable Inputs (Level 2)    
Assets    
Marketable securities 0 0
Significant Unobservable Inputs (Level 3)    
Assets    
Marketable securities 0 0
Reported Value Measurement    
Assets    
Marketable securities $ 8,984 $ 10,433