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Fair Value Measurements
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements
FAIR VALUE MEASUREMENTS
The Company’s money market funds and interest rate swaps are reported on the Company’s consolidated balance sheets at fair values based on market values from identical or comparable transactions. The fair value of the Company’s money market funds, stock warrant obligations, convertible note, convertible note hedges and interest rate swaps are based on observable inputs (Level 2) from comparable market transactions. The fair value of the stock warrant obligations were determined using a Black-Scholes pricing model which considers the Company’s common stock price and various assumptions, such as the volatility of the Company’s common stock, the expected dividend yield, and the risk-free interest rate. The fair value of the note conversion obligations and the convertible note hedges were estimated using a Black-Scholes pricing model and incorporate the terms and conditions of the underlying financial instruments. The valuations are, among other things, subject to changes in both the Company's credit worthiness and the counter-parties to the instruments as well as change in general market conditions. While the change in fair value of the note conversion obligations and the convertible note hedges are generally expected to move in opposite directions, the net change in any given period may be material.
The following table reflects assets and liabilities that are measured at fair value on a recurring basis (in thousands):
 
As of June 30, 2018
Fair Value Measurement Using
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Assets
 
 
 
 
 
 
 
Cash equivalents—money market
$

 
$
20,835

 
$

 
$
20,835

Interest rate swap

 
4,992

 

 
4,992

Total Assets
$

 
$
25,827

 
$

 
$
25,827

Liabilities
 
 
 
 
 
 
 
Stock warrant obligations

 
(203,426
)
 

 
(203,426
)
Total Liabilities
$

 
$
(203,426
)
 
$

 
$
(203,426
)
As of December 31, 2017
Fair Value Measurement Using
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Assets
 
 
 
 
 
 
 
Cash equivalents—money market
$

 
$
1,326

 
$

 
$
1,326

Interest rate swap

 
1,840

 

 
1,840

Convertible note hedges

 
53,683

 

 
53,683

Total Assets
$

 
$
56,849

 
$

 
$
56,849

Liabilities
 
 
 
 
 
 
 
Note conversion obligations

 
(54,359
)
 

 
(54,359
)
Stock warrant obligation

 
(211,136
)
 

 
(211,136
)
Total Liabilities
$

 
$
(265,495
)
 
$

 
$
(265,495
)

As a result of higher market interest rates compared to the stated interest rates of the Company’s fixed rate debt obligations, the fair value of the Company’s debt obligations, based on Level 2 observable inputs, was approximately $7.7 million less than the carrying value, which was $520.7 million at June 30, 2018. As of December 31, 2017, the fair value of the Company’s debt obligations was approximately $9.1 million more than the carrying value, which was $515.8 million. The non-financial assets, including goodwill, intangible assets and property and equipment are measured at fair value on a non-recurring basis.