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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Financial assets and liabilities measured at fair value on a recurring basis
The following table represents the Company's fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2014 and 2013 (in thousands):
 
December 31, 2014
 
December 31, 2013
 
Fair Value Measurements Using Input Types
 
 
 
Fair Value Measurements Using Input Types
 
 
 
Level 2
 
Level 3
 
Total
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
$
1,258

 
$

 
$
1,258

 
$
185

 
$

 
$
185

Non-marketable securities

 
3,384

 
3,384

 

 
4,383

 
4,383

Total assets
$
1,258

 
$
3,384

 
$
4,642

 
$
185

 
$
4,383

 
$
4,568

 
 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 

 
 

 
 

 
 
 
 
 
 
Derivative liabilities
$

 
$

 
$

 
$
938

 
$

 
$
938

Fair value of non-marketable securities
The following table summarizes the change in the fair value of the Company's non-marketable securities during the year ended December 31, 2014 (in thousands).
Balance as of December 31, 2013
$
4,383

Sales
(3,133
)
Impairment
(139
)
Realized gain
2,548

Unrealized gain
(275
)
Balance as of December 31, 2014
$
3,384