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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30, 2017 and December 31, 2016:
   
Carrying
Value
 
Fair Value Measurement at June 30, 2017
   
Level 1
 
Level 2
 
Level 3
 
(Unaudited - In thousands)
Cash and cash equivalents
$
48,181

 
$
48,181

 
$
—

 
$
—

Long-term restricted cash equivalents
6,336

 
6,336

 
—

—

—

Marketable securities—held-to-maturity:
   
 
   
 
   
 
   
Certificates of deposit
$
5,422

 
$
5,422

 
$
—

 
$
—

 Total marketable securities
$
5,422

 
$
5,422

 
$
—

 
$
—

 
Carrying
Value
 
Fair Value Measurement at December 31, 2016
   
Level 1
 
Level 2
 
Level 3
 
(Unaudited - In thousands)
Cash and cash equivalents
$
22,058

 
$
22,058

 
$
—

 
$
—

Long-term restricted cash equivalents
6,336

 
6,336

 
—

 
—

Marketable securities—held-to-maturity:
   
 
 
 
 
 
 
Certificates of deposit
$
15,686

 
$
15,686

 
$
—

 
$
—

 Total marketable securities
$
15,686

 
$
15,686

 
$
—

 
$
—