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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Summary of the valuation of cash equivalents and marketable securities by pricing levels
The following table presents the financial instruments that are carried at fair value and summarizes the valuation of its cash equivalents and marketable securities by the above pricing levels as of December 31, 2016 and 2015:
 
As of December 31, 2016
 
Total
 
Quoted Market Prices in Active Markets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
 
(In thousands)
Money market funds
$
10,681

 
$
10,681

 
$
—

 
$
—

U.S. Government bonds and notes
48,292

 
—

 
48,292

 
—

Corporate notes, bonds, commercial paper and other
62,178

 
303

 
61,875

 
—

Total available-for-sale securities
$
121,151

 
$
10,984

 
$
110,167

 
$
—

 
As of December 31, 2015
 
Total
 
Quoted Market Prices in Active Markets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
 
(In thousands)
Money market funds
$
77,804

 
$
77,804

 
$
—

 
$
—

U.S. Government bonds and notes
14,110

 
—

 
14,110

 
—

Corporate notes, bonds, commercial paper and other
160,823

 
1,264

 
159,559

 
—

Total available-for-sale securities
$
252,737

 
$
79,068

 
$
173,669

 
$
—
Financial instruments not carried at fair value but requiring fair value disclosure
The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure as of December 31, 2016 and 2015:
 
As of December 31, 2016
 
As of December 31, 2015

(in thousands)
Face
Value
 
Carrying Value
 
Fair
Value
 
Face
Value
 
Carrying Value
 
Fair
Value
1.125% Convertible Senior Notes due 2018
138,000

 
126,167

 
173,961

 
138,000

 
119,418

 
156,292