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Cash and Cash Equivalents and Available for Sale Securities (Tables)
9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Available for sale Securities
Available for sale securities, including carrying value and estimated fair values, are summarized as follows:

 
As of September 30, 2017
 
 
Amortized Cost
 
Fair Value
 
Unrealized
Gain
 
 
(in thousands)
 
Asset backed securities
8,192

 
8,192

 

 
Corporate debt securities
33,973

 
33,976

 
3

 
Total
$
42,165

 
$
42,168

 
$
3