XML 41 R30.htm IDEA: XBRL DOCUMENT v3.8.0.1
Cash and Cash Equivalents and Investments in Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2018
Cash, Cash Equivalents, and Short-term Investments [Abstract]  
Available-For-Sale Securities
The following is a summary of our marketable securities as of December 31, 2017:
 
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
(Net Carrying Amount)
 
 
(In thousands)
December 31, 2017
 
 
 
 
 
 
 
 
Commercial paper
 
$
—

 
$
—

 
$
—

 
$
—

Corporate debt securities
 
—

 
—

 
—

 
—

State and political subdivisions debt securities
 
—

 
—

 
—

 
—

Total marketable securities
 
$
—

 
$
—

 
$
—

 
$
—