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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30, 2017 and December 31, 2016:
 
As of June 30, 2017
 
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
$
15,460

 
$
15,460

 
$
—

 
$
—

U.S. Government bonds and notes
63,612

 
—

 
63,612

 
—

Corporate notes, bonds, commercial paper and other
37,754

 
746

 
37,008

 
—

Total available-for-sale securities
$
116,826

 
$
16,206

 
$
100,620

 
$
—

 
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

 
$
—
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 require fair value disclosure as of June 30, 2017 and December 31, 2016:
 
 
As of June 30, 2017
 
As of December 31, 2016
(In thousands)
 
Face
 Value
 
Carrying
 Value
 
Fair Value
 
Face
 Value
 
Carrying
 Value
 
Fair Value
1.125% Convertible Senior Notes due 2018 (the "2018 Notes")
 
$
138,000

 
$
129,690

 
$
151,386

 
$
138,000

 
$
126,167

 
$
173,961