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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
Our short and long-term investment securities consisted of the following (in thousands):
 
As of March 31, 2019
 
Amortized Cost
 
Unrealized Holding Gains (Losses)
 
Fair Value
Short-term corporate bonds
$
17,214

 
$
—

 
$
17,214

Long-term corporate bonds
2,021

 
—

 
2,021

Total investment securities
$
19,235

 
$
—

 
$
19,235

 
 
 
 
 
 
 
As of December 31, 2018
 
Amortized Cost
 
Unrealized Holding Gains (Losses)
 
Fair Value
Short-term corporate bonds
$
37,329

 
$
—

 
$
37,329

Long-term corporate bonds
2,025

 
—

 
2,025

Total investment securities
$
39,354

 
$
—

 
$
39,354