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Fair Value of Financial Instruments
12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 2016 and 2015 (in thousands):
 
 
December 31, 2016
 
December 31, 2015
 
Fair Value
 
Level 1
 
Level 2
 
Level 3
 
Fair Value
 
Level 1
 
Level 2
 
Level 3
Cash equivalents
$
48,136

 
$
48,136

 
$
—

 
$
—

 
$
61,986

 
$
61,986

 
$
—

 
$
—

Corporate bonds
60,676

 
—

 
60,676

 
—

 
56,109

 
—

 
56,109

 
—

Agency bonds
28,930

 
—

 
28,930

 
—

 
85,461

 
—

 
85,461

 
—

U.S. treasury securities
157,686

 
—

 
157,686

 
—

 
57,908

 
—

 
57,908

 
—

Commercial paper
10,473

 
—

 
10,473

 
—

 
—

 
—

 
—

 
—

Strategic investments
—

 
—

 
—

 
—

 
150

 
—

 
—

 
150

 
$
305,901

 
$
48,136

 
$
257,765

 
$
—

 
$
261,614

 
$
61,986

 
$
199,478

 
$
150


The Company’s cash equivalents at December 31, 2016 and 2015 consisted of money market funds backed by U.S. Treasury securities. Cash equivalents are classified as Level 1.
As of December 31, 2016, corporate bonds, agency bonds, U.S. treasury securities and commercial paper were classified within Level 2 of the fair value hierarchy. The bonds were valued using information obtained from pricing services, which obtained quoted market prices from a variety of industry data providers, security master files from large financial institutions, and other third-party sources. The Company performed supplemental analysis to validate information obtained from its pricing services. As of December 31, 2016, no adjustments were made to such pricing information.
Strategic Investments
The Company’s investments in privately-held companies are shown in the accompanying Consolidated Balance Sheets in Long-term investments and accompanying Consolidated Statements of Cash Flows in Purchases of investments. The strategic investments classified as debt securities are considered Level 3 in the fair value hierarchy as they have been valued using significant unobservable inputs or data from various valuation approaches and is measured each reporting period at fair value.
The following table presents a reconciliation of the investment in debt securities measured at fair value using significant unobservable inputs (Level 3) as of December 31, 2016 (in thousands):
Balance as of December 31, 2015
$
150

Fair value adjustment
(150
)
Balance as of December 31, 2016
$
—


Senior Convertible Notes
The Company’s senior convertible notes are shown in the accompanying Consolidated Balance Sheets at their original issuance value, net of unamortized discount and debt issuance costs, and are not re-measured to fair value each period. The approximate fair value of the Company’s convertible notes as of December 31, 2016 was $264.3 million. The fair value of the convertible notes was estimated on the basis of quoted market prices, which, due to limited trading activity, are considered Level 2 in the fair value hierarchy.