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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2015
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 September 30, 2015 and December 31, 2014:
   
Carrying
Value
 
Fair Value Measurement at September 30, 2015
   
Level 1
 
Level 2
 
Level 3
 
(Unaudited - In thousands)
Cash and cash equivalents
$
63,708

 
$
63,708

 
$
—

 
$
—

Marketable securities—held-to-maturity:
   
 
   
 
   
 
   
Certificates of deposit
$
40,465

 
$
40,465

 
$
—

 
$
—

 Total marketable securities
$
40,465

 
$
40,465

 
$
—

 
$
—

 
Carrying
Value
 
Fair Value Measurement at December 31, 2014
   
Level 1
 
Level 2
 
Level 3
 
(Unaudited - In thousands)
Cash and cash equivalents
$
111,897

 
$
111,897

 
$
—

 
$
—

Marketable securities—held-to-maturity:
   
 
 
 
 
 
 
Commercial paper
$
6,596

 
$
6,596

 
$
—

 
$
—

U.S. treasury bills
1,503

 
1,503

 
—

 
—

Government agency bonds
503

 
503

 
—

 
—

Certificates of deposit
36,026

 
36,026

 
—

 
—

 Total marketable securities
$
44,628

 
$
44,628

 
$
—

 
$
—