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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities
Below is a summary of our marketable securities as of December 31, 2018 (in thousands):
 
 
December 31, 2018
 
 
Amortized Cost
 
Unrealized Loss
 
Estimated Fair Value
Marketable securities
 
$
249,944

 
$
(342
)
 
$
249,602