XML 23 R12.htm IDEA: XBRL DOCUMENT v3.19.2
Marketable Securities
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities

As of December 31, 2018, our marketable securities consisted of United States Treasury notes and were classified as available-for-sale. The United States Treasury notes matured in January and February 2019, and as of June 30, 2019, we do not have any 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