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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Carrying Value and Fair Value of Certain Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table provides the carrying value and fair value of certain financial assets and liabilities of the Company measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017:
   
Carrying
Value
 
Fair Value Measurement at March 31, 2018
   
Level 1
 
Level 2
 
Level 3
 
(Unaudited - In thousands)
Cash and cash equivalents
$
31,294

 
$
31,294

 
$
—

 
$
—

Marketable securities—held-to-maturity:
   
 
   
 
   
 
   
Certificates of deposit
$
3,044

 
$
3,044

 
$
—

 
$
—

 
Carrying
Value
 
Fair Value Measurement at December 31, 2017
   
Level 1
 
Level 2
 
Level 3
 
(Unaudited - In thousands)
Cash and cash equivalents
$
20,751

 
$
20,751

 
$
—

 
$
—

Long-term restricted cash equivalents
6,336

 
6,336

 
—

 
—

Trading securities
3,761

 
3,761

 
—

 
—

Marketable securities—held-to-maturity:
   
 
 
 
 
 
 
Certificates of deposit
$
4,452

 
$
4,452

 
$
—

 
$
—